Question: A scientist observes that both birds and snakes in the same ecosystem depend on the same mouse species as a food source. The relationship between the birds and the snakes is an example of

Choices:
A. predation.
B. mutualism.
C. competition.
D. commensalism.

Answer: C

Question: A scientist observes that both birds and snakes in the same ecosystem depend on the same mouse species as a food source. The relationship between the birds and the snakes is an example of
Answer:


Question: A roller coaster is climbing up the highest hill on its track. At which point will the front car of the coaster most likely have its greatest potential energy?

Choices:
A. at the bottom of the highest hill
B. at the top of the highest hill
C. at the start of the track
D. at the end of the track

Answer: B

Question: A roller coaster is climbing up the highest hill on its track. At which point will the front car of the coaster most likely have its greatest potential energy?
Answer:


Question: Animal cells perform functions using energy that is derived from glucose (C6H12O6). Which molecule is required for animal cells to obtain the most energy possible from a molecule of glucose?

Choices:
A. water
B. oxygen
C. lactic acid
D. carbon dioxide

Answer: B

Question: Animal cells perform functions using energy that is derived from glucose (C6H12O6). Which molecule is required for animal cells to obtain the most energy possible from a molecule of glucose?
Answer:


Question: Which particle type can be identified as being from a specific element?

Choices:
A. electron
B. atom
C. neutron
D. proton

Answer: B

Question: Which particle type can be identified as being from a specific element?
Answer:


Question: A drug company developed a pill to reduce cases of stomach virus. To test the medication, half of the participants got the pill with the new medicine and half got a sugar pill. Which term best identifies the participants who got a sugar pill?

Choices:
A. control
B. experimental
C. dependent variable
D. independent variable

Answer: A

Question: A drug company developed a pill to reduce cases of stomach virus. To test the medication, half of the participants got the pill with the new medicine and half got a sugar pill. Which term best identifies the participants who got a sugar pill?
Answer:


Question: Which energy source is considered nonrenewable?

Choices:
1. moving water
2. fossil fuel
3. wind
4. biomass

Answer: 2

Question: Which energy source is considered nonrenewable?
Answer:


Question: A company is making prototypes for a new computer system. Which of the following statements best describes an advantage of making several different prototypes?

Choices:
A. They can be tested at the same time.
B. They can be produced in large numbers.
C. They will be bought by many different users.
D. They will be sold for more than they cost to build.

Answer: A

Question: A company is making prototypes for a new computer system. Which of the following statements best describes an advantage of making several different prototypes?
Answer:


Question: Many things can contribute to the development of a theory. A student made a list of some things that might help scientists develop a theory. Observations Calculations Conversations Publications From the student's list, which must be used in the development of every theory?

Choices:
A. Observations
B. Conversations
C. Publications and calculations
D. Calculations and conversations

Answer: A

Question: Many things can contribute to the development of a theory. A student made a list of some things that might help scientists develop a theory. Observations Calculations Conversations Publications From the student's list, which must be used in the development of every theory?
Answer:


Question: The breakdown of ozone into oxygen results from the electromagnetic absorption spectrum of ozone. This production of oxygen in the ozone layer is caused by exposing ozone to a strong source of which type of electromagnetic radiation?

Choices:
A. radio waves
B. microwaves
C. infrared light
D. ultraviolet light

Answer: D

Question: The breakdown of ozone into oxygen results from the electromagnetic absorption spectrum of ozone. This production of oxygen in the ozone layer is caused by exposing ozone to a strong source of which type of electromagnetic radiation?
Answer:


Question: A cricket population includes approximately the same number of black and light-brown crickets. Black crickets are easier for birds to locate and eat. Over time, the population begins to consist of only light-brown crickets. The change in the color of the cricket population is a result of

Choices:
A. limited resources.
B. natural selection.
C. geographic isolation.
D. climate change.

Answer: B

Question: A cricket population includes approximately the same number of black and light-brown crickets. Black crickets are easier for birds to locate and eat. Over time, the population begins to consist of only light-brown crickets. The change in the color of the cricket population is a result of
Answer:


Question: As children grow, their body height usually

Choices:
A. decreases
B. increases
C. remains the same

Answer: B

Question: As children grow, their body height usually
Answer:


Question: Which of the following is responsible for determining the traits of an organism?

Choices:
A. number of phosphates
B. amount of thymine
C. sequence of nucleotides
D. type of bond between bases

Answer: C

Question: Which of the following is responsible for determining the traits of an organism?
Answer:


Question: A scientist was observing a unicellular organism over a period of time. He noticed that vacuoles kept moving to the same place in the plasma membrane to empty their contents outside the cell. Which organism was he observing?

Choices:
A. amoeba
B. euglena
C. paramecium
D. volvox

Answer: C

Question: A scientist was observing a unicellular organism over a period of time. He noticed that vacuoles kept moving to the same place in the plasma membrane to empty their contents outside the cell. Which organism was he observing?
Answer:


Question: During the Siberian summer, reindeer graze on young roots, fungi, grass, and other vegetation. In the cold winter months, they migrate south and rely on available, but less nutritious food, such as lichen. Increased snowfall during the entire winter in southern areas would result in reindeer having to

Choices:
A. return to their summer feeding area.
B. hibernate until the snows have stopped.
C. hunt for organisms such as small rodents.
D. move to other areas to compete for resources.

Answer: D

move to other areas to compete for resources.

Question: During the Siberian summer, reindeer graze on young roots, fungi, grass, and other vegetation. In the cold winter months, they migrate south and rely on available, but less nutritious food, such as lichen. Increased snowfall during the entire winter in southern areas would result in reindeer having to
Answer:


Question: A small aluminum cube is dropped into a beaker of water to determine the buoyancy. Which of these is not necessary in determining the buoyant force acting on the cube?

Choices:
A. density of water
B. displaced volume
C. gravitational pull on Earth
D. density of the aluminum cube

Answer: D

Question: A small aluminum cube is dropped into a beaker of water to determine the buoyancy. Which of these is not necessary in determining the buoyant force acting on the cube?
Answer:


Question: What are the characteristics of maritime polar air masses?

Choices:
A. cool and dry
B. warm and dry
C. cool and humid
D. warm and humid

Answer: C

Question: What are the characteristics of maritime polar air masses?
Answer:


Question: Which three things do animals need from their environment in order to survive?

Choices:
A. soil, water, and food
B. soil, light, and water
C. air, food, and water
D. air, water, and light

Answer: C

Question: Which three things do animals need from their environment in order to survive?
Answer:


Question: When using a microscope, it is best to use a wet mount to

Choices:
A. observe live organisms.
B. show the interior of sliced objects.
C. highlight objects with chemical dyes.
D. remove debris that is obscuring the object.

Answer: A

Question: When using a microscope, it is best to use a wet mount to
Answer:


Question: In order to maintain good health, humans should

Choices:
A. eat foods high in fat
B. exercise regularly
C. drink alcohol often
D. smoke tobacco occasionally

Answer: B

Question: In order to maintain good health, humans should
Answer:


Question: A baby bird must eat a lot of food to grow. During which stage of its life cycle is a butterfly most similar to a baby bird?

Choices:
A. egg
B. larva
C. pupa
D. adult

Answer: B

Question: A baby bird must eat a lot of food to grow. During which stage of its life cycle is a butterfly most similar to a baby bird?
Answer:


Question: When the fuel in a gasoline engine is burned, the energy conversion is from

Choices:
A. chemical to thermal.
B. potential to nuclear.
C. thermal to potential.
D. electrical to kinetic.

Answer: A

Question: When the fuel in a gasoline engine is burned, the energy conversion is from
Answer:


Question: The best soil mixture for plant growth and drainage is

Choices:
A. silt, pebbles, and clay.
B. sand, rocks, and clay.
C. humus, clay, and sand.
D. clay, silt, and rocks.

Answer: C

Question: The best soil mixture for plant growth and drainage is
Answer:


Question: Which part of Earth's structure exists in the solid phase due to low temperatures?

Choices:
A. the inner core
B. the outer core
C. the lithosphere
D. the asthenosphere

Answer: C

Question: Which part of Earth's structure exists in the solid phase due to low temperatures?
Answer:


Question: Which of the following properties best describes a material's ability to resist scratching?

Choices:
A. weight
B. flexibility
C. length
D. hardness

Answer: D

Question: Which of the following properties best describes a material's ability to resist scratching?
Answer:


Question: Which chemical is a compound?

Choices:
A. helium (He)
B. hydrochloric acid (HCl)
C. hydrogen (H2)
D. nitrogen (N2)

Answer: B

Question: Which chemical is a compound?
Answer:


Question: The electrical charge of the nucleus of an atom is +12. How many electrons does the atom have in its neutral state?

Choices:
A. 6
B. 12
C. 18
D. 24

Answer: B

Question: The electrical charge of the nucleus of an atom is +12. How many electrons does the atom have in its neutral state?
Answer:


Question: A change in the pattern of warm ocean currents can cause a climate change by

Choices:
A. releasing thermal energy in irregular spurts.
B. absorbing thermal energy from the Sun's rays.
C. moving thermal energy from one place to another.
D. increasing the ocean's capacity for absorbing thermal energy.

Answer: C

moving thermal energy from one place to another.

Question: A change in the pattern of warm ocean currents can cause a climate change by
Answer:


Question: A student plans to grow algal colonies in solutions with different concentrations of liquid fertilizer. Which is a clear and testable hypothesis to guide this investigation?

Choices:
A. Algae like fertilizer.
B. Fertilizer is good for algae.
C. Fertilizer improves the genetic traits of algae.
D. Algal growth rate increases with fertilizer concentration.

Answer: D

Algal growth rate increases with fertilizer concentration.

Question: A student plans to grow algal colonies in solutions with different concentrations of liquid fertilizer. Which is a clear and testable hypothesis to guide this investigation?
Answer:


Question: A rocket is traveling toward space. What force must the rocket act against as it moves away from Earth?

Choices:
A. inertia
B. gravity
C. magnetism
D. momentum

Answer: B

Question: A rocket is traveling toward space. What force must the rocket act against as it moves away from Earth?
Answer:


Question: A teacher breaks a bar of pure copper into two different sized pieces. Which is the most likely difference between the two pieces?

Choices:
A. mass
B. texture
C. boiling point
D. melting point

Answer: A

Question: A teacher breaks a bar of pure copper into two different sized pieces. Which is the most likely difference between the two pieces?
Answer:


Question: Which substance can be used to conduct electricity in a circuit?

Choices:
A. metal
B. wood
C. rubber
D. plastic

Answer: A

Question: Which substance can be used to conduct electricity in a circuit?
Answer:


Question: The first stage of soil formation is the weathering of rock into fine particles. To make a good soil for growing plants, which would be best to add to the rock particles?

Choices:
A. minerals
B. sand
C. organic matter
D. silt

Answer: C

Question: The first stage of soil formation is the weathering of rock into fine particles. To make a good soil for growing plants, which would be best to add to the rock particles?
Answer:


Question: Water vapor sometimes condenses into stratus clouds that are in contact with the ground. What forms as a result of this process?

Choices:
A. ozone
B. methane
C. fog
D. smoke

Answer: C

Question: Water vapor sometimes condenses into stratus clouds that are in contact with the ground. What forms as a result of this process?
Answer:


Question: Which of these is a structure that is present in all organisms?

Choices:
A. a tissue
B. a cell
C. a stomach
D. a brain

Answer: B

Question: Which of these is a structure that is present in all organisms?
Answer:


Question: What is one way to help slow down or stop the greenhouse effect?

Choices:
A. find new coal resources in the earth
B. clean up the litter in neighborhoods
C. clean up the water pollution in local lakes
D. walk or ride a bike instead of driving a car

Answer: D

walk or ride a bike instead of driving a car

Question: What is one way to help slow down or stop the greenhouse effect?
Answer:


Question: Which of the following is certain to change as a ball accelerates?

Choices:
A. mass of the ball
B. inertia of the ball
C. velocity of the ball
D. force acting on the ball

Answer: C

Question: Which of the following is certain to change as a ball accelerates?
Answer:


Question: How are light and sound similar?

Choices:
A. They both travel at the same speed.
B. They are both waves.
C. They are both electromagnetic.
D. They both travel through a vacuum.

Answer: B

Question: How are light and sound similar?
Answer:


Question: Which is the most accurate model to show how amino acids form proteins?

Choices:
A. bees in a hive
B. cars on a train
C. petals on a flower
D. pieces in a jigsaw puzzle

Answer: B

Question: Which is the most accurate model to show how amino acids form proteins?
Answer:


Question: Which of these diseases is caused by a bacterium?

Choices:
A. rabies
B. influenza
C. strep throat
D. chicken pox

Answer: C

Question: Which of these diseases is caused by a bacterium?
Answer:


Question: For years, scientists have classified plants according to their characteristics. Which most likely has led scientists to better identify and discover new species of plants?

Choices:
A. construction of 3-D models
B. advances in the study of DNA
C. understanding the process of mitosis
D. development of the scientific method

Answer: B

Question: For years, scientists have classified plants according to their characteristics. Which most likely has led scientists to better identify and discover new species of plants?
Answer:


Question: In a laboratory, a sealed container with 100 g of steam is cooled until all the steam becomes a liquid. The container is then cooled further until all the water becomes a solid. Which of the following remains constant during both of these changes?

Choices:
A. the mass of the water
B. the pressure in the container
C. the total energy of the water
D. the position of the atoms in the container

Answer: A

Question: In a laboratory, a sealed container with 100 g of steam is cooled until all the steam becomes a liquid. The container is then cooled further until all the water becomes a solid. Which of the following remains constant during both of these changes?
Answer:


Question: Which life function is the same for an amoeba as for other freshwater protists?

Choices:
A. the method used to obtain nutrients and energy
B. the process used to constantly remove excess water
C. the method used to detect changes in their environment
D. the process used to remove waste products from their cytoplasm

Answer: B

the process used to constantly remove excess water

Question: Which life function is the same for an amoeba as for other freshwater protists?
Answer:


Question: Eagles have strong, sharp beaks that are most likely adapted for the eagle to eat

Choices:
A. fish.
B. eggs.
C. worms.
D. flowers.

Answer: A

Question: Eagles have strong, sharp beaks that are most likely adapted for the eagle to eat
Answer:


Question: Which of the following characteristics is an acquired trait?

Choices:
A. height
B. hair color
C. language
D. eye shape

Answer: C

Question: Which of the following characteristics is an acquired trait?
Answer:


Question: Which human response is most likely to occur because the air temperature is 90°F?

Choices:
A. blinking
B. salivating
C. shivering
D. sweating

Answer: D

Question: Which human response is most likely to occur because the air temperature is 90°F?
Answer:


Question: Which is a trait a human most directly inherits from its parents?

Choices:
A. eye color
B. musical taste
C. career choice
D. interest in reading

Answer: A

Question: Which is a trait a human most directly inherits from its parents?
Answer:


Question: Which pair of systems is responsible for the flow of blood in the human body?

Choices:
A. circulatory and skeletal systems
B. skeletal and excretory systems
C. muscular and circulatory systems
D. respiratory and muscular systems

Answer: C

Question: Which pair of systems is responsible for the flow of blood in the human body?
Answer:


Question: Ribosomes present in a particular cell are smaller than those found in plants. In which taxonomic group or groups could the cell be classified?

Choices:
A. fungi only
B. archaea only
C. bacteria or archaea
D. bacteria or fungi

Answer: C

Question: Ribosomes present in a particular cell are smaller than those found in plants. In which taxonomic group or groups could the cell be classified?
Answer:


Question: The best explanation of why carnivores are dependent on plants is because they

Choices:
A. need to consume plant matter.
B. use plants for shelter.
C. need carbon dioxide released by plants.
D. consume other animals that eat plants.

Answer: D

Question: The best explanation of why carnivores are dependent on plants is because they
Answer:


Question: Some one-celled organisms can reproduce by the process of

Choices:
1. hormone secretion
2. metamorphosis
3. fertilization
4. cell division

Answer: 4

Question: Some one-celled organisms can reproduce by the process of
Answer:


Question: A scanning electron microscope is best suited for observing

Choices:
A. diffraction of light.
B. tectonic features on planets.
C. the surfaces of small objects.
D. topographical features on the ocean floor.

Answer: C

Question: A scanning electron microscope is best suited for observing
Answer:


Question: Which body system processes foods into a useable source of energy?

Choices:
A. circulatory
B. digestive
C. nervous
D. skeletal

Answer: B

Question: Which body system processes foods into a useable source of energy?
Answer:


Question: The symptoms of strep throat infection are a red and swollen throat. What is the most likely cause of strep throat?

Choices:
A. eating raw vegetables
B. drinking lemonade
C. invading bacteria
D. running in cold weather

Answer: C

Question: The symptoms of strep throat infection are a red and swollen throat. What is the most likely cause of strep throat?
Answer:


Question: Which is an effect of regular exercise?

Choices:
A. weaker bones
B. less energy
C. better hearing
D. stronger heart

Answer: D

Question: Which is an effect of regular exercise?
Answer:


Question: Which is the lowest level of environmental organization that would include the water quality and air temperature in an area?

Choices:
A. biome
B. ecosystem
C. community
D. population

Answer: B

Question: Which is the lowest level of environmental organization that would include the water quality and air temperature in an area?
Answer:


Question: Tissue plasminogen activator is a natural blood thinner. The coded sequence for the blood thinner is called PLAT , found on chromosome 8. It is used to treat people who have heart attacks and strokes. Tissue plasminogen activator can be made through genetic engineering. What is tissue plasminogen activator?

Choices:
A. a gene
B. a protein
C. a platelet
D. a DNA molecule

Answer: B

Question: Tissue plasminogen activator is a natural blood thinner. The coded sequence for the blood thinner is called PLAT , found on chromosome 8. It is used to treat people who have heart attacks and strokes. Tissue plasminogen activator can be made through genetic engineering. What is tissue plasminogen activator?
Answer:


Question: As seen from Earth, the appearance of the Moon changes throughout the month. What causes the appearance of the Moon to change?

Choices:
A. Earth rotating on its axis
B. the Moon rotating on its axis
C. Earth revolving around the Sun
D. the Moon revolving around Earth

Answer: D

Question: As seen from Earth, the appearance of the Moon changes throughout the month. What causes the appearance of the Moon to change?
Answer:


Question: The freezing and expanding of water in the cracks of rocks is a form of

Choices:
A. weathering.
B. deposition.
C. faulting.
D. erosion.

Answer: A

Question: The freezing and expanding of water in the cracks of rocks is a form of
Answer:


Question: Which piece of safety equipment is used to keep mold spores from entering the respiratory system?

Choices:
A. safety goggles
B. breathing mask
C. rubber gloves
D. lead apron

Answer: B

Question: Which piece of safety equipment is used to keep mold spores from entering the respiratory system?
Answer:


Question: Which of these correctly identifies the way materials are transported in a plant?

Choices:
A. Xylem carries water from the roots to the leaves.
B. Phloem carries minerals from the roots to the leaves.
C. Xylem carries sugars from the flowers to the stems.
D. Phloem carries water from the flowers to the stems.

Answer: A

Xylem carries water from the roots to the leaves.

Question: Which of these correctly identifies the way materials are transported in a plant?
Answer:


Question: A dish of sugar water was left on a window sill. One week later, there were only sugar crystals left in the dish. The water was gone. The best explanation for the appearance of sugar crystals is

Choices:
A. some of the water was absorbed by the dish.
B. the air condensed.
C. the light shining on the window sill produced more sugar.
D. the water evaporated.

Answer: D

Question: A dish of sugar water was left on a window sill. One week later, there were only sugar crystals left in the dish. The water was gone. The best explanation for the appearance of sugar crystals is
Answer:


Question: Biologists conduct investigations to learn about living organisms. Which method helps reduce bias during an investigation?

Choices:
A. developing a hypothesis after collecting data in the investigation
B. limiting the amount of background research before the investigation
C. designing an investigation with repeated trials during the investigation
D. obtaining other opinions concerning what should happen during the investigation

Answer: C

designing an investigation with repeated trials during the investigation

Question: Biologists conduct investigations to learn about living organisms. Which method helps reduce bias during an investigation?
Answer:


Question: Antarctica is a continent at Earth's south pole. Fossils of tropical fern plants were discovered in Antarctica even though these plants do not grow there today. Which conclusion does the fossil evidence best support?

Choices:
A. Millions of years ago, Antarctica was in a warmer location on Earth.
B. Recently, a natural disaster killed all of the fern plants in Antarctica.
C. Recently, birds stopped carrying the seeds of fern plants to Antarctica.
D. Millions of years ago, Earth's south pole was much colder than it is today.

Answer: A

Millions of years ago, Antarctica was in a warmer location on Earth.

Question: Antarctica is a continent at Earth's south pole. Fossils of tropical fern plants were discovered in Antarctica even though these plants do not grow there today. Which conclusion does the fossil evidence best support?
Answer:


Question: During science class, a teacher explains that the samples the students are studying are made of two or more minerals. What are the students studying?

Choices:
A. gases
B. rocks
C. elements
D. molecules

Answer: B

Question: During science class, a teacher explains that the samples the students are studying are made of two or more minerals. What are the students studying?
Answer:


Question: In the United States, windmills have been used for farming for hundreds of years. Which simple machine is the most important part of a windmill?

Choices:
A. lever
B. pulley
C. inclined plane
D. wheel and axle

Answer: D

Question: In the United States, windmills have been used for farming for hundreds of years. Which simple machine is the most important part of a windmill?
Answer:


Question: Which factor determines if two individuals are members of the same species?

Choices:
A. They live in the same habitat and niche.
B. They forage and eat the same type of food.
C. They mate and produce fertile offspring.
D. They are similar in appearance and color.

Answer: C

They mate and produce fertile offspring.

Question: Which factor determines if two individuals are members of the same species?
Answer:


Question: Marta studied different forms of energy. Which two types of energy travel in waves?

Choices:
A. light and sound
B. electrical and sound
C. chemical and light
D. chemical and electrical

Answer: A

Question: Marta studied different forms of energy. Which two types of energy travel in waves?
Answer:


Question: Jonathon was studying bears. He found out that bears are born with some behaviors and learn others from their environment. Which behavior does a bear most likely inherit?

Choices:
A. how to find food in garbage cans
B. how to hibernate during the winter
C. how to seek shelter in a hollow log
D. how to live in human neighborhoods

Answer: B

Question: Jonathon was studying bears. He found out that bears are born with some behaviors and learn others from their environment. Which behavior does a bear most likely inherit?
Answer:


Question: Which of these traits is most influenced by environment?

Choices:
A. weight
B. hair color
C. blood type
D. handedness

Answer: A

Question: Which of these traits is most influenced by environment?
Answer:


Question: Some animals have behaviors that help them find food when little is available. Which best describes an animal with this type of behavior?

Choices:
A. a robin that builds a nest
B. an owl that calls at night
C. a duck that swims in water
D. a goose that migrates in winter

Answer: D

Question: Some animals have behaviors that help them find food when little is available. Which best describes an animal with this type of behavior?
Answer:


Question: A cook touches a hot stove and quickly moves his hand away. What are the two primary body systems that work together to produce this response?

Choices:
A. Integumentary and endocrine systems
B. Muscular and respiratory systems
C. Nervous and muscular systems
D. Skeletal and nervous systems

Answer: C

Question: A cook touches a hot stove and quickly moves his hand away. What are the two primary body systems that work together to produce this response?
Answer:


Question: Which two human body systems are most responsible for getting oxygen to cells?

Choices:
A. digestive and skeletal
B. skeletal and circulatory
C. circulatory and respiratory
D. respiratory and digestive

Answer: C

Question: Which two human body systems are most responsible for getting oxygen to cells?
Answer:


Question: Air is composed of many different substances. Which of the following components of air is a compound rather than an element?

Choices:
A. Argon, Ar
B. Oxygen, O2
C. Water, H2O
D. Nitrogen, N2

Answer: C

Question: Air is composed of many different substances. Which of the following components of air is a compound rather than an element?
Answer:


Question: What are the three common states of matter?

Choices:
A. liquid, gas, vapor
B. gas, liquid, fluid
C. solid, gas, liquid
D. solid, vapor, liquid

Answer: C

Question: What are the three common states of matter?
Answer:


Question: If you place a thermometer into a glass of boiling water, what temperature should the thermometer read?

Choices:
A. 32°C
B. 100°C
C. 200°C
D. 212°C

Answer: B

Question: If you place a thermometer into a glass of boiling water, what temperature should the thermometer read?
Answer:


Question: Squirrels in cold climates gather and store food for winter. The squirrels sometimes bury nuts and then do not return for them. These nuts can grow to become trees. This chain of events is an example of

Choices:
A. predation
B. seed distribution
C. competition
D. seed fossilization

Answer: B

Question: Squirrels in cold climates gather and store food for winter. The squirrels sometimes bury nuts and then do not return for them. These nuts can grow to become trees. This chain of events is an example of
Answer:


Question: On a field trip in a wooded area, you see a small, strange object. You wonder whether it is a live animal. The best way to find out is to observe the object to see if it

Choices:
A. has an odor.
B. has separate parts.
C. can make a noise and has a lifelike color.
D. carries out basic life functions.

Answer: D

Question: On a field trip in a wooded area, you see a small, strange object. You wonder whether it is a live animal. The best way to find out is to observe the object to see if it
Answer:


Question: Which object works best when reflecting light?

Choices:
A. mirror
B. camera
C. binoculars
D. eyeglasses

Answer: A

Question: Which object works best when reflecting light?
Answer:


Question: Which of these systems functions to protect and support vital organs?

Choices:
A. digestive
B. skeletal
C. nervous
D. excretory

Answer: B

Question: Which of these systems functions to protect and support vital organs?
Answer:


Question: As two continental plates collide, the edges of the plates are crumpled and uplifted. Which of these landforms is most likely a result of this type of collision?

Choices:
A. normal faults
B. mountain ranges
C. U-shaped valleys
D. shield volcanoes

Answer: B

Question: As two continental plates collide, the edges of the plates are crumpled and uplifted. Which of these landforms is most likely a result of this type of collision?
Answer:


Question: Which of the following could help to reduce a home heating bill in winter?

Choices:
A. replacing wood doors with aluminum doors
B. using more insulation in the walls of the home
C. removing thick rugs and heavy curtains in the home
D. painting the roof of the home white to reflect light

Answer: B

using more insulation in the walls of the home

Question: Which of the following could help to reduce a home heating bill in winter?
Answer:


Question: Students are attempting to make a doorbell ring using some wire and a battery. What is needed to make the bell ring?

Choices:
A. friction
B. gravity
C. a convection current
D. an electrical circuit

Answer: D

Question: Students are attempting to make a doorbell ring using some wire and a battery. What is needed to make the bell ring?
Answer:


Question: Which is the function of the gallbladder?

Choices:
A. store bile
B. produce bile
C. store digestive enzymes
D. produce digestive enzymes

Answer: A

Question: Which is the function of the gallbladder?
Answer:


Question: Carmine's mother drinks four cans of soft drink each day. After drinking the soft drinks, Carmine's mother should

Choices:
A. throw the cans in the trash.
B. send the cans to a landfill.
C. take the cans to be recycled.
D. crush the cans before putting them in the trash.

Answer: C

Question: Carmine's mother drinks four cans of soft drink each day. After drinking the soft drinks, Carmine's mother should
Answer:


Question: Chromium is characterized by a very high melting point. Use the Periodic Table of the Elements to identify which of these elements most likely has a similar melting point.

Choices:
A. potassium
B. manganese
C. bromine
D. krypton

Answer: B

Question: Chromium is characterized by a very high melting point. Use the Periodic Table of the Elements to identify which of these elements most likely has a similar melting point.
Answer:


Question: A student rolls a ball on the ground. Which of these causes the ball to slow down and then stop?

Choices:
A. The motion of the ball
B. The speed of the ball
C. Friction from the ground
D. A magnetic field

Answer: C

Question: A student rolls a ball on the ground. Which of these causes the ball to slow down and then stop?
Answer:


Question: Refrigerators were invented to keep food cold. This is helpful in

Choices:
A. growing food.
B. cleaning food.
C. keeping food dry.
D. keeping food fresh.

Answer: D

Question: Refrigerators were invented to keep food cold. This is helpful in
Answer:


Question: A hammer and a screwdriver are next to each other in the sunlight. After one hour, the hammer is hotter than the screwdriver. The shape and mass of each object may affect the amount of heat each object gains. Another explanation for the difference in temperature may be that the hammer and screwdriver are

Choices:
A. moving at different rates.
B. made of different materials.
C. used for different purposes.
D. picked up in different ways.

Answer: B

Question: A hammer and a screwdriver are next to each other in the sunlight. After one hour, the hammer is hotter than the screwdriver. The shape and mass of each object may affect the amount of heat each object gains. Another explanation for the difference in temperature may be that the hammer and screwdriver are
Answer:


Question: During its lifetime, a star will evolve through several stages. In which stage does a star spend most of its life?

Choices:
A. red giant
B. red dwarf
C. white dwarf
D. main sequence

Answer: D

Question: During its lifetime, a star will evolve through several stages. In which stage does a star spend most of its life?
Answer:


Question: Earth is tilted as it travels around the Sun. The tilt changes the amount of energy each area gets from the Sun, which makes some months of the year warmer than others. What are the four main temperature changes in a year called?

Choices:
A. seasons
B. climate
C. weather
D. quarters

Answer: A

Question: Earth is tilted as it travels around the Sun. The tilt changes the amount of energy each area gets from the Sun, which makes some months of the year warmer than others. What are the four main temperature changes in a year called?
Answer:


Question: Which liquid most likely contains a dissolved gas?

Choices:
A. whole milk
B. house paint
C. mud puddle
D. carbonated soda

Answer: D

Question: Which liquid most likely contains a dissolved gas?
Answer:


Question: Which human organ system produces most of the hormones that regulate body functions?

Choices:
1. digestive
2. nervous
3. muscular
4. endocrine

Answer: 4

Question: Which human organ system produces most of the hormones that regulate body functions?
Answer:


Question: Panels of solar cells are used to collect energy from the Sun and convert it into energy for use in homes. Into what type of energy is the solar energy converted?

Choices:
A. chemical
B. electrical
C. geothermal
D. hydroelectric

Answer: B

Question: Panels of solar cells are used to collect energy from the Sun and convert it into energy for use in homes. Into what type of energy is the solar energy converted?
Answer:


Question: Which statement describes the most likely effect of transformation on bacteria such as E. coli?

Choices:
A. Transformed bacteria express a new protein product.
B. Transformed bacteria have multiple chromosomes.
C. Transformed bacteria reproduce more quickly.
D. Transformed bacteria become a new species.

Answer: A

Transformed bacteria express a new protein product.

Question: Which statement describes the most likely effect of transformation on bacteria such as E. coli?
Answer:


Question: Which of the following is a part of the process of sexual reproduction?

Choices:
A. budding
B. regeneration
C. pollination
D. fragmentation

Answer: C

Question: Which of the following is a part of the process of sexual reproduction?
Answer:


Question: Which is an example of a form of electrical energy?

Choices:
A. lightning
B. windmill
C. radio waves
D. sound waves

Answer: A

Question: Which is an example of a form of electrical energy?
Answer:


Question: Which of these is a chemical property of a material?

Choices:
A. density
B. flammability
C. color
D. brittleness

Answer: B

Question: Which of these is a chemical property of a material?
Answer:


Question: People take in and release gases from the air when they breathe. Which exhaled gas is a waste product of respiration?

Choices:
A. oxygen
B. helium
C. hydrogen
D. carbon dioxide

Answer: D

Question: People take in and release gases from the air when they breathe. Which exhaled gas is a waste product of respiration?
Answer:


Question: A group of frogs live together near a small pond. The frogs compete with each other most for which resource?

Choices:
A. air
B. insects
C. plants
D. sunlight

Answer: B

Question: A group of frogs live together near a small pond. The frogs compete with each other most for which resource?
Answer:


Question: What advantage do the offspring of a dandelion have by reproducing asexually?

Choices:
A. Reproduction occurs rapidly.
B. Reproductive competition is increased.
C. Mating compatibility improves.
D. Diversity increases between generations.

Answer: A

Question: What advantage do the offspring of a dandelion have by reproducing asexually?
Answer:


Question: The solar system containing Earth consists of a sun and planets. Which statement best describes the motion of the planets in our solar system?

Choices:
A. The planets rotate around the sun.
B. The sun rotates around the planets.
C. The planets revolve around the sun.
D. The sun revolves around the planets.

Answer: C

Question: The solar system containing Earth consists of a sun and planets. Which statement best describes the motion of the planets in our solar system?
Answer:


Question: Which of the following metals will be attracted to a magnet?

Choices:
A. copper
B. gold
C. iron
D. silver

Answer: C

Question: Which of the following metals will be attracted to a magnet?
Answer:


Question: What covers most of the Earth's surface?

Choices:
A. Water
B. Bare rock
C. Farm land
D. Cities and towns

Answer: A

Question: What covers most of the Earth's surface?
Answer:


Question: Which statement describes the weather when water droplets in clouds become heavy and the temperature is 20°C (68°F)?

Choices:
A. It is clear and breezy.
B. It is raining.
C. It is snowing.
D. It is sunny and clear.

Answer: B

Question: Which statement describes the weather when water droplets in clouds become heavy and the temperature is 20°C (68°F)?
Answer:


Question: The discovery of tectonic plates and the cause of their movement is best described as a result of which scientific procedure?

Choices:
A. direct observation of the important properties of the Earth system
B. controlled laboratory experimentation on a simulation of geological systems
C. methodical testing of a valid hypothesis statement
D. inquiry into the causes of observed geological phenomena

Answer: D

inquiry into the causes of observed geological phenomena

Question: The discovery of tectonic plates and the cause of their movement is best described as a result of which scientific procedure?
Answer:


Question: Which physical characteristic of a puppy is most likely inherited from its parents?

Choices:
A. coat color
B. desire to play fetch
C. body weight
D. ability to follow commands

Answer: A

Question: Which physical characteristic of a puppy is most likely inherited from its parents?
Answer:


Question: Which of the following is a necessary condition for a lunar eclipse to occur?

Choices:
A. The Moon must be full.
B. The Moon must be waxing.
C. It must be the beginning of the month.
D. It must be winter in the Northern Hemisphere.

Answer: A

Question: Which of the following is a necessary condition for a lunar eclipse to occur?
Answer:


Question: Which organisms break down dead matter and recycle nutrients back into the ecosystem?

Choices:
A. grasses and trees
B. rabbits and deer
C. lions and alligators
D. mushrooms and bacteria

Answer: D

Question: Which organisms break down dead matter and recycle nutrients back into the ecosystem?
Answer:


Question: Which is Earth's largest source of drinkable water?

Choices:
A. lakes
B. rivers
C. oceans
D. aquifers

Answer: D

Question: Which is Earth's largest source of drinkable water?
Answer:


Question: Which of these is the main source of the electromagnetic energy we use?

Choices:
A. battery
B. wind
C. sun
D. coal

Answer: C

Question: Which of these is the main source of the electromagnetic energy we use?
Answer:


Question: A hearing aid is a small device that contains an amplifier, a battery, a microphone, and a speaker. Which part of a hearing aid functions to detect sounds in the user's environment?

Choices:
A. the amplifier
B. the battery
C. the microphone
D. the speaker

Answer: C

Question: A hearing aid is a small device that contains an amplifier, a battery, a microphone, and a speaker. Which part of a hearing aid functions to detect sounds in the user's environment?
Answer:


Question: Which of these senses lets Dora know when a skunk has been close to her house?

Choices:
A. Taste
B. Touch
C. Smell
D. Hearing

Answer: C

Question: Which of these senses lets Dora know when a skunk has been close to her house?
Answer:


Question: Stars form from nebulae of dust and gases. Depending on its properties, a star may become a red, yellow, white, or blue star. Which property determines this star type?

Choices:
A. age
B. location
C. mass
D. shape

Answer: C

Question: Stars form from nebulae of dust and gases. Depending on its properties, a star may become a red, yellow, white, or blue star. Which property determines this star type?
Answer:


Question: Students observed that a diamond was able to scratch a piece of talc. What does this observation best support?

Choices:
A. Diamonds have sharp edges.
B. Talc is softer than diamonds.
C. Diamonds are very valuable.
D. Talc and diamonds are both minerals.

Answer: B

Question: Students observed that a diamond was able to scratch a piece of talc. What does this observation best support?
Answer:


Question: What unit of measure should Jerry use to report the volume of a liquid?

Choices:
A. degrees Celsius
B. kilograms
C. milliliters
D. centimeters

Answer: C

Question: What unit of measure should Jerry use to report the volume of a liquid?
Answer:


Question: Why is it not a safe practice to place a fuel depot over an aquifer?

Choices:
A. Aquifers are too high up in the mountains.
B. The weight of the depot is too great over the aquifer.
C. The fumes escaping from the fuel depot are explosive.
D. If the fuel leaks, the water in the aquifer will become contaminated.

Answer: D

If the fuel leaks, the water in the aquifer will become contaminated.

Question: Why is it not a safe practice to place a fuel depot over an aquifer?
Answer:


Question: Which factor determines whether precipitation will be in the form of rain or snow?

Choices:
A. wind
B. humidity
C. air pressure
D. temperature

Answer: D

Question: Which factor determines whether precipitation will be in the form of rain or snow?
Answer:


Question: Gasoline is a nonrenewable energy resource used in most cars and trucks. Gasoline is made from which source?

Choices:
A. oil
B. hydrogen
C. natural gas
D. water vapor

Answer: A

Question: Gasoline is a nonrenewable energy resource used in most cars and trucks. Gasoline is made from which source?
Answer:


Question: Some processes that shape Earth's surface are slow. Other processes are rapid. Which statement describes a rapid change?

Choices:
A. Glaciers melt and form rivers.
B. Wind weathers rocks into sand.
C. Earthquakes move land and rocks.
D. Rivers carry sediment and build deltas.

Answer: C

Question: Some processes that shape Earth's surface are slow. Other processes are rapid. Which statement describes a rapid change?
Answer:


Question: When a small group of organisms colonizes a new habitat, the population may be genetically different from the parent population due to differences in allele frequencies. The process responsible for this is

Choices:
A. natural selection.
B. disruptive selection.
C. genetic drift.
D. genetic equilibrium.

Answer: C

Question: When a small group of organisms colonizes a new habitat, the population may be genetically different from the parent population due to differences in allele frequencies. The process responsible for this is
Answer:


Question: Which sequence has the states of matter listed from least to greatest kinetic energy?

Choices:
A. solid -> gas -> liquid
B. gas -> liquid -> solid
C. liquid -> solid -> gas
D. solid -> liquid -> gas

Answer: D

Question: Which sequence has the states of matter listed from least to greatest kinetic energy?
Answer:


Question: During the light reactions of photosynthesis, energy is stored in the compounds ATP and NADPH. A second set of reactions uses this stored energy to produce vital compounds such as glucose. This second set of reactions involves a biochemical pathway called

Choices:
A. the Calvin cycle.
B. carbon fixation.
C. respiration.
D. transpiration.

Answer: A

Question: During the light reactions of photosynthesis, energy is stored in the compounds ATP and NADPH. A second set of reactions uses this stored energy to produce vital compounds such as glucose. This second set of reactions involves a biochemical pathway called
Answer:


Question: In order for a material to be effective for cooking, it must have which physical property?

Choices:
A. low melting point
B. high electric charge
C. high reactivity with water
D. low thermal expansion

Answer: D

Question: In order for a material to be effective for cooking, it must have which physical property?
Answer:


Question: When tectonic plates move, they can form different landforms. Which is least likely to be associated with the tectonic plate movement that forms volcanoes?

Choices:
A. hot spot
B. rift valley
C. subduction zone
D. transform boundary

Answer: D

Question: When tectonic plates move, they can form different landforms. Which is least likely to be associated with the tectonic plate movement that forms volcanoes?
Answer:


Question: Electrical energy is best described as

Choices:
A. coming from the Sun.
B. attracting objects.
C. moving negative charges.
D. developing radiation.

Answer: C

Question: Electrical energy is best described as
Answer:


Question: A person must lift a heavy load of bricks to the top of a building. Which simple machine is best used for this task?

Choices:
A. a wedge
B. a pulley
C. an inclined plane
D. a wheel and axle

Answer: B

Question: A person must lift a heavy load of bricks to the top of a building. Which simple machine is best used for this task?
Answer:


Question: Which difference between water and ice results in ice floating on cold water?

Choices:
A. heat
B. shape
C. density
D. volume

Answer: C

Question: Which difference between water and ice results in ice floating on cold water?
Answer:


Question: Scientists have shown that clearing the forest in the Amazon for farming is causing the extinction of native species. Which is the most direct cause of extinction from clear-cutting of land?

Choices:
A. pollution
B. habitat loss
C. climate change
D. use of fertilizers

Answer: B

Question: Scientists have shown that clearing the forest in the Amazon for farming is causing the extinction of native species. Which is the most direct cause of extinction from clear-cutting of land?
Answer:


Question: Which explains the relationship between hours of sunlight and seasons?

Choices:
A. the rotation of Earth on its axis
B. the tilt of Earth's axis relative to the sun
C. the location of Earth's orbit in the solar system
D. the motion of the moon as it travels around Earth

Answer: B

the tilt of Earth's axis relative to the sun

Question: Which explains the relationship between hours of sunlight and seasons?
Answer:


Question: Coal is a fossil fuel that is formed from

Choices:
A. water eroding the land.
B. meteors hitting Earth.
C. repeated volcanic eruptions.
D. the decay of organic material.

Answer: D

Question: Coal is a fossil fuel that is formed from
Answer:


Question: Which structure controls what enters both plant cells and animal cells?

Choices:
A. nucleus
B. cell wall
C. chloroplast
D. cell membrane

Answer: D

Question: Which structure controls what enters both plant cells and animal cells?
Answer:


Question: Which is a function of a seed?

Choices:
A. forming fruit
B. making pollen
C. storing food for a new plant
D. taking in water from the ground

Answer: C

Question: Which is a function of a seed?
Answer:


Question: Newborn white-tailed deer have hundreds of spots on their coats which gradually disappear at three to four months of age. The spots on their coats make the newborns blend in with the environment through

Choices:
A. mimicry.
B. migration.
C. hibernation.
D. camouflage.

Answer: D

Question: Newborn white-tailed deer have hundreds of spots on their coats which gradually disappear at three to four months of age. The spots on their coats make the newborns blend in with the environment through
Answer:


Question: Which is a factor that most likely would affect the climate in a particular area?

Choices:
A. amount of lightning
B. distance from an ocean
C. number of earthquakes
D. shape of the shoreline

Answer: B

Question: Which is a factor that most likely would affect the climate in a particular area?
Answer:


Question: Which material is a good conductor of heat?

Choices:
A. plastic
B. rubber
C. glass
D. copper

Answer: D

Question: Which material is a good conductor of heat?
Answer:


Question: When heat flows from a hot spot to a cooler spot, entropy increases. When heat is forced to flow from a cool spot to a warmer spot, entropy decreases. Marta is looking for something in her house that causes a decrease in entropy. Which of these should she choose?

Choices:
A. an ice cube melting
B. the refrigerator
C. an egg frying
D. the toaster

Answer: B

Question: When heat flows from a hot spot to a cooler spot, entropy increases. When heat is forced to flow from a cool spot to a warmer spot, entropy decreases. Marta is looking for something in her house that causes a decrease in entropy. Which of these should she choose?
Answer:


Question: According to the endosymbiotic theory, the outer membrane of the chloroplast originated from which organelle?

Choices:
A. the lysosome of an engulfed prokaryotic cell
B. the chloroplast of an engulfed prokaryotic cell
C. the cell membrane of an eukaryotic host cell
D. the chloroplast of an eukaryotic host cell

Answer: C

the cell membrane of an eukaryotic host cell

Question: According to the endosymbiotic theory, the outer membrane of the chloroplast originated from which organelle?
Answer:


Question: Which is a response of the autonomic nervous system that helps maintain equilibrium in the body?

Choices:
A. shivering in cold temperatures
B. eating due to appetite
C. slapping at biting insects
D. pulling away from hot objects

Answer: A

Question: Which is a response of the autonomic nervous system that helps maintain equilibrium in the body?
Answer:


Question: Many insects go through metamorphosis. Which series shows the stages of complete metamorphosis correctly?

Choices:
A. egg, nymph, pupa, adult
B. egg, larva, nymph, adult
C. egg, nymph 1, nymph 2, adult
D. egg, larva, pupa, adult

Answer: D

Question: Many insects go through metamorphosis. Which series shows the stages of complete metamorphosis correctly?
Answer:


Question: Which information would probably be most helpful to someone trying to identify a mineral sample?

Choices:
1. location and mass of the sample
2. shape and texture of the sample
3. hardness and streak of the sample
4. color and size of the sample

Answer: 3

Question: Which information would probably be most helpful to someone trying to identify a mineral sample?
Answer:


Question: Which of the following is a first-level consumer?

Choices:
A. wolf
B. hawk
C. carrot
D. rabbit

Answer: D

Question: Which of the following is a first-level consumer?
Answer:


Question: Which human activity would have the greatest positive impact on the water quality of a stream?

Choices:
A. releasing warm water into the stream
B. driving cars through the stream
C. reducing use of fertilizers near the stream
D. increasing use of chemicals near the stream

Answer: C

reducing use of fertilizers near the stream

Question: Which human activity would have the greatest positive impact on the water quality of a stream?
Answer:


Question: Which of these is necessary for life on Earth?

Choices:
A. water
B. trees
C. wind
D. soil

Answer: A

Question: Which of these is necessary for life on Earth?
Answer:


Question: On which date does North America usually experience the longest period of daylight?

Choices:
1. March 21
2. June 21
3. September 21
4. December 21

Answer: 2

Question: On which date does North America usually experience the longest period of daylight?
Answer:


Question: What is one way people are helping the environment?

Choices:
A. They are planting trees to replace the ones that are cut.
B. They are building more roads so more people can see natural areas.
C. They are building more dumps to hold the trash we create.
D. They are using their cars more to get to places faster.

Answer: A

They are planting trees to replace the ones that are cut.

Question: What is one way people are helping the environment?
Answer:


Question: A bicyclist rides on a flat road and then stops pedaling but does not apply the brakes. The bicycle stops because of ___.

Choices:
A. balance
B. friction
C. attraction
D. magnetism

Answer: B

Question: A bicyclist rides on a flat road and then stops pedaling but does not apply the brakes. The bicycle stops because of ___.
Answer:


Question: Which is an effect that cities have on the weather?

Choices:
A. Small numbers of plants cause rain to fall more often.
B. Large numbers of houses cause the wind to be stronger.
C. Small areas of open water cause fog to be more common.
D. Large areas of pavement cause the temperature to be hotter.

Answer: D

Large areas of pavement cause the temperature to be hotter.

Question: Which is an effect that cities have on the weather?
Answer:


Question: Seismometers measure quick changes that happen in the crust of our planet. Which of the following is a seismometer used to measure?

Choices:
A. earthquake
B. erosion
C. flooding
D. weathering

Answer: A

Question: Seismometers measure quick changes that happen in the crust of our planet. Which of the following is a seismometer used to measure?
Answer:


Question: Materials that let electrons flow very easily from one atom to another

Choices:
A. are called insulators.
B. are called conductors.
C. are called non-metals.
D. are called resistors.

Answer: B

Question: Materials that let electrons flow very easily from one atom to another
Answer:


Question: What is the liquid layer of Earth that lies beneath the mantle?

Choices:
A. inner core
B. outer core
C. mesosphere
D. asthenosphere

Answer: B

Question: What is the liquid layer of Earth that lies beneath the mantle?
Answer:


Question: Which human organ system eliminates liquid and gaseous wastes from the body?

Choices:
1. circulatory
2. endocrine
3. excretory
4. reproductive

Answer: 3

Question: Which human organ system eliminates liquid and gaseous wastes from the body?
Answer:


Question: Which tool should a carpenter use to measure the length of a wooden board?

Choices:
A. balance
B. meter stick
C. thermometer
D. graduated cylinder

Answer: B

Question: Which tool should a carpenter use to measure the length of a wooden board?
Answer:


Question: Which best explains why stars seen in the night sky are less bright than the Sun?

Choices:
A. Other stars are farther from Earth than the Sun.
B. Other stars are facing away from Earth.
C. Other stars are smaller than the Sun.
D. Other stars are producing less light.

Answer: A

Other stars are farther from Earth than the Sun.

Question: Which best explains why stars seen in the night sky are less bright than the Sun?
Answer:


Question: Which of these is the fundamental unit of life?

Choices:
A. system
B. organ
C. tissue
D. cell

Answer: D

Question: Which of these is the fundamental unit of life?
Answer:


Question: A student wrote the following claim on a homework assignment: "Eukaryotic cells need more lipids than prokaryotic cells." Which statement below provides the BEST support for her claim?

Choices:
A. Eukaryotic cells have a nucleus.
B. Eukaryotic cells make up multicellular organisms.
C. Eukaryotic cells contain membrane-bound organelles.
D. Eukaryotic cells perform cellular respiration.

Answer: C

Eukaryotic cells contain membrane-bound organelles.

Question: A student wrote the following claim on a homework assignment: "Eukaryotic cells need more lipids than prokaryotic cells." Which statement below provides the BEST support for her claim?
Answer:


Question: Which trait gives owls an advantage when hunting at night?

Choices:
A. large eyes
B. broad wings
C. straight beak
D. smooth feathers

Answer: A

Question: Which trait gives owls an advantage when hunting at night?
Answer:


Question: Which of the following is NOT a mixture?

Choices:
A. Smoke
B. Sugar
C. Milk
D. Paint

Answer: B

Question: Which of the following is NOT a mixture?
Answer:


Question: 7. What is the cause of most earthquakes?

Choices:
A. the rotation of Earth
B. the direction of the wind
C. the pull of Earth's gravity
D. the movement of plates on Earth's crust

Answer: D

Question: 7. What is the cause of most earthquakes?
Answer:


Question: Brian knows deserts get less rain than other ecosystems. However, he also knows that plants can survive in the desert. Which characteristic of a plant most likely helps it live in a desert?

Choices:
A. the ability to store water
B. the ability to attract insects
C. the ability to stop predators
D. the ability to drop its leaves

Answer: A

Question: Brian knows deserts get less rain than other ecosystems. However, he also knows that plants can survive in the desert. Which characteristic of a plant most likely helps it live in a desert?
Answer:


Question: The Sun heats the atmosphere of Earth unevenly. Which of the following is the most likely result of this uneven heating?

Choices:
A. Convection in the atmosphere causes a change in air density, resulting in winds.
B. Conduction through the atmosphere causes evaporation to occur over oceans, resulting in rain.
C. Radiation from the Sun will reflect through the atmosphere back into space resulting in cooler evenings.
D. Radiation from the Sun will cause atmospheric moisture to collect over mountain ranges resulting in snowfall.

Answer: A

Convection in the atmosphere causes a change in air density, resulting in winds.

Question: The Sun heats the atmosphere of Earth unevenly. Which of the following is the most likely result of this uneven heating?
Answer:


Question: Water cycles through three states of matter on Earth. What has the greatest effect on the state of matter of water?

Choices:
A. tides
B. gravity
C. the sun
D. the moon

Answer: C

Question: Water cycles through three states of matter on Earth. What has the greatest effect on the state of matter of water?
Answer:


Question: A cell completes the synthesization of a protein by adding a carbohydrate to the protein's structure. At which site in the cell is the carbohydrate added?

Choices:
A. the nucleus
B. a ribosome
C. a mitochondrion
D. the Golgi apparatus

Answer: D

Question: A cell completes the synthesization of a protein by adding a carbohydrate to the protein's structure. At which site in the cell is the carbohydrate added?
Answer:


Question: Which is the most cooperative relationship between species?

Choices:
A. mutualism
B. predation
C. parasitism
D. coexistence

Answer: A

Question: Which is the most cooperative relationship between species?
Answer:


Question: Which is a function of the cardiovascular system?

Choices:
A. to move water throughout the body
B. to provide structural support for the body
C. to eliminate waste from the body
D. to transport gases throughout the body

Answer: D

Question: Which is a function of the cardiovascular system?
Answer:


Question: A piece of pine wood floats on the surface of a lake because the water exerts

Choices:
A. an upward force equal to the weight of the wood.
B. a downward force equal to the weight of the wood.
C. an upward force equal to the weight of the displacement water.
D. a downward force equal to the weight of the displacement water.

Answer: C

an upward force equal to the weight of the displacement water.

Question: A piece of pine wood floats on the surface of a lake because the water exerts
Answer:


Question: Which of these tools is most helpful to a scientist observing very small bacteria?

Choices:
A. ruler
B. telescope
C. microscope
D. meter stick

Answer: C

Question: Which of these tools is most helpful to a scientist observing very small bacteria?
Answer:


Question: Weather stations built in urban areas can be influenced by the human-made structures that surround these stations. Some of these weather stations used to determine mean temperatures in the United States have had the validity of the data questioned. Which human-produced effect could these urban weather stations be measuring?

Choices:
A. heat island
B. rain shadow
C. land breeze
D. cold front

Answer: A

Question: Weather stations built in urban areas can be influenced by the human-made structures that surround these stations. Some of these weather stations used to determine mean temperatures in the United States have had the validity of the data questioned. Which human-produced effect could these urban weather stations be measuring?
Answer:


Question: The Moon is in orbit around Earth. What keeps the Moon from changing its orbit?

Choices:
A. friction
B. gravity
C. weight
D. rotation

Answer: B

Question: The Moon is in orbit around Earth. What keeps the Moon from changing its orbit?
Answer:


Question: Scientists have observed that, even within the same nest, some young birds call louder than others. Which describes how a louder cry helps to ensure survival?

Choices:
A. Lung capacity is increased.
B. Exposure to bacteria is increased.
C. Parents are able to identify the nest.
D. Parents respond by giving more food.

Answer: D

Question: Scientists have observed that, even within the same nest, some young birds call louder than others. Which describes how a louder cry helps to ensure survival?
Answer:


Question: A scientist found a fossil of an organism that had gills. When the organism was living, the area in which it lived was most likely covered by ___.

Choices:
A. forest
B. grassland
C. bare rock
D. water

Answer: D

Question: A scientist found a fossil of an organism that had gills. When the organism was living, the area in which it lived was most likely covered by ___.
Answer:


Question: Coal, oil, and natural gas have high potential energies, which makes them valuable energy resources. In order to benefit from the energy available in these fossil fuels, the potential energy is converted most directly into which type of energy?

Choices:
A. chemical
B. electrical
C. solar
D. thermal

Answer: D

Question: Coal, oil, and natural gas have high potential energies, which makes them valuable energy resources. In order to benefit from the energy available in these fossil fuels, the potential energy is converted most directly into which type of energy?
Answer:


Question: The human hearing range is 20-20,000 hertz. A sound Peggy heard was measured at 15,000 hertz. Which characteristic best describes the sound wave that Peggy heard?

Choices:
A. fast speed
B. high frequency
C. large amplitude
D. long wavelength

Answer: B

Question: The human hearing range is 20-20,000 hertz. A sound Peggy heard was measured at 15,000 hertz. Which characteristic best describes the sound wave that Peggy heard?
Answer:


Question: Which is an SI unit for density?

Choices:
A. lb
B. kg
C. lb/ft^3
D. kg/m^3

Answer: D

Question: Which is an SI unit for density?
Answer:


Question: Fertilizers can enable farmers to grow the same crop in a field for several years in a row. Farmers who use less fertilizer often rotate their crops by planting the crop one year and legumes, such as beans and clover, the following year. Fertilizer use and crop rotation with legumes both increase the availability of which of the following nutrients in soil?

Choices:
A. calcium
B. nitrogen
C. oxygen
D. protein

Answer: B

Question: Fertilizers can enable farmers to grow the same crop in a field for several years in a row. Farmers who use less fertilizer often rotate their crops by planting the crop one year and legumes, such as beans and clover, the following year. Fertilizer use and crop rotation with legumes both increase the availability of which of the following nutrients in soil?
Answer:


Question: Greenhouse gases in the atmosphere absorb infrared radiation from Earth's surface and re-radiates some of it back to Earth. Which of these gases have the most significant impact on the temperature of Earth's atmosphere?

Choices:
A. nitrogen and argon
B. oxygen and sulfur dioxide
C. carbon dioxide and water vapor
D. hydrochloric acid and hydrogen

Answer: C

Question: Greenhouse gases in the atmosphere absorb infrared radiation from Earth's surface and re-radiates some of it back to Earth. Which of these gases have the most significant impact on the temperature of Earth's atmosphere?
Answer:


Question: Earth has a limited supply of fresh drinking water. Which method is used to recycle water for humans to use?

Choices:
A. bottling water
B. dam construction
C. collecting rainwater
D. wastewater treatment

Answer: D

Question: Earth has a limited supply of fresh drinking water. Which method is used to recycle water for humans to use?
Answer:


Question: While hiking through Granville State Forest, a student finds an unusual plant-like organism that appears to lack chlorophyll. When the student examines a sample using a microscope, he sees many cells with cell walls and no chloroplasts. This organism is most likely a member of what Kingdom?

Choices:
A. Animalia
B. Eubacteria
C. Fungi
D. Protista

Answer: C

Question: While hiking through Granville State Forest, a student finds an unusual plant-like organism that appears to lack chlorophyll. When the student examines a sample using a microscope, he sees many cells with cell walls and no chloroplasts. This organism is most likely a member of what Kingdom?
Answer:


Question: When conducting an investigation involving an open flame, it is most important to

Choices:
A. turn out the lights to see better.
B. smell the product that is being burned.
C. work near the sink to put out possible fires.
D. wear appropriate protective clothing and eyewear.

Answer: D

wear appropriate protective clothing and eyewear.

Question: When conducting an investigation involving an open flame, it is most important to
Answer:


Question: Carbon dioxide produced by cells is removed from the body primarily by which body system?

Choices:
A. digestive
B. excretory
C. immune
D. respiratory

Answer: D

Question: Carbon dioxide produced by cells is removed from the body primarily by which body system?
Answer:


Question: Which system is most responsible for transporting blood throughout the body?

Choices:
A. skeletal system
B. excretory system
C. digestive system
D. circulatory system

Answer: D

Question: Which system is most responsible for transporting blood throughout the body?
Answer:


Question: Hurricanes are large, powerful storms that form as they travel over warm ocean waters. What do oceans add to make hurricanes so strong?

Choices:
A. salt and water
B. wind and tides
C. heat and moisture
D. waves and flooding

Answer: C

Question: Hurricanes are large, powerful storms that form as they travel over warm ocean waters. What do oceans add to make hurricanes so strong?
Answer:


Question: Which of these had the greatest impact on the current shape of Nevada's basin and range landscape?

Choices:
A. tidal forces
B. wind erosion
C. plate tectonics
D. global warming

Answer: C

Question: Which of these had the greatest impact on the current shape of Nevada's basin and range landscape?
Answer:


Question: Which would be the best conductor of electricity?

Choices:
A. air
B. cork
C. water
D. silver

Answer: D

Question: Which would be the best conductor of electricity?
Answer:


Question: A girl found the skull of an animal. She did not know what the animal was but she was sure that it preyed on other animals for its food. What clue led to this conclusion?

Choices:
A. The eye sockets faced sideways.
B. The skull was much longer than it was wide.
C. There was a projecting ridge along the top of the skull.
D. Four of the teeth were long and pointed.
E. The jaws could move sideways as well as up and down.

Answer: D

Four of the teeth were long and pointed.

Question: A girl found the skull of an animal. She did not know what the animal was but she was sure that it preyed on other animals for its food. What clue led to this conclusion?
Answer:


Question: A delta at the mouth of a river is the direct result of

Choices:
A. runoff from sewage.
B. deposition of sediment.
C. an ancient glacier that passed through.
D. an underground river flowing to the ocean.

Answer: B

Question: A delta at the mouth of a river is the direct result of
Answer:


Question: A scientific article about the universe will most likely describe the universe as

Choices:
A. consisting of billions of galaxies.
B. being less than two billion years old.
C. containing approximately ten planets.
D. becoming smaller over time.

Answer: A

Question: A scientific article about the universe will most likely describe the universe as
Answer:


Question: How does flipping a switch turn on a light?

Choices:
A. It creates a spark.
B. It breaks an electrical circuit.
C. It generates electricity.
D. It completes an electrical circuit.

Answer: D

Question: How does flipping a switch turn on a light?
Answer:


Question: Which of these will most likely result from small meteoroids entering the atmosphere of Earth?

Choices:
A. a decrease in air temperature
B. the appearance of shooting stars
C. an decrease in atmospheric ozone
D. the appearance of the Northern Lights

Answer: B

Question: Which of these will most likely result from small meteoroids entering the atmosphere of Earth?
Answer:


Question: Many scientists are convinced that an increase of certain gases in the atmosphere is affecting global temperatures. What makes this hypothesis difficult to prove?

Choices:
A. Trees absorb these gases.
B. Global temperatures are rising.
C. Many variables affect global temperatures.
D. Many human activities produce these gases.

Answer: C

Many variables affect global temperatures.

Question: Many scientists are convinced that an increase of certain gases in the atmosphere is affecting global temperatures. What makes this hypothesis difficult to prove?
Answer:


Question: Which mineral is most likely to be found in all of the three major rock types known as metamorphic, igneous, and sedimentary?

Choices:
A. halite
B. quartz
C. gypsum
D. sulfur

Answer: B

Question: Which mineral is most likely to be found in all of the three major rock types known as metamorphic, igneous, and sedimentary?
Answer:


Question: Which animal is an example of an annelid?

Choices:
A. an anteater
B. a honey bee
C. a sea star
D. an earthworm

Answer: D

Question: Which animal is an example of an annelid?
Answer:


Question: Which tools are used to determine the boiling point of water?

Choices:
A. hot plate and stopwatch
B. thermometer and balance
C. hot plate and thermometer
D. balance and graduated cylinder

Answer: C

Question: Which tools are used to determine the boiling point of water?
Answer:


Question: A mineral sample is obtained from a box, and acid is dropped on the sample to determine if it bubbles. Which best describes what should be done with the mineral after testing it?

Choices:
A. Return the mineral to its box.
B. Rinse the mineral with water, dry it, and return it to the box.
C. Wipe the mineral with a paper towel and return it to the box.
D. Put the mineral in the sink and leave it for the teacher to clean up.

Answer: B

Rinse the mineral with water, dry it, and return it to the box.

Question: A mineral sample is obtained from a box, and acid is dropped on the sample to determine if it bubbles. Which best describes what should be done with the mineral after testing it?
Answer:


Question: All living things are made up of prokaryotic or eukaryotic cells. Which function is found in both prokaryotic and eukaryotic cells?

Choices:
A. aerobic respiration
B. sexual reproduction
C. protein production
D. nitrogen fixation

Answer: C

Question: All living things are made up of prokaryotic or eukaryotic cells. Which function is found in both prokaryotic and eukaryotic cells?
Answer:


Question: Which of these includes Earth?

Choices:
A. the asteroid belt
B. the Andromeda Galaxy
C. the solar system
D. the Eagle Nebula

Answer: C

Question: Which of these includes Earth?
Answer:


Question: The structures in the bodies of many organisms have levels of organization that help the body to carry out life processes. Which list correctly shows how these levels are organized from the simplest to the most complex?

Choices:
A. tissue, cell, organ, organ system
B. organ, cell, organ system, tissue
C. cell, tissue, organ, organ system
D. organ system, tissue, organ, cell

Answer: C

Question: The structures in the bodies of many organisms have levels of organization that help the body to carry out life processes. Which list correctly shows how these levels are organized from the simplest to the most complex?
Answer:


Question: If it is determined that the particles in one solid are arranged in a repeating pattern and the particles in another solid are arranged randomly, what must be true about the solids?

Choices:
A. They are different substances.
B. They have the same weight.
C. They have the same densities.
D. They are different mixtures.

Answer: A

Question: If it is determined that the particles in one solid are arranged in a repeating pattern and the particles in another solid are arranged randomly, what must be true about the solids?
Answer:


Question: Which of these careers would a student studying biotechnology most likely pursue?

Choices:
A. electrical engineering
B. astronomy
C. agricultural research
D. geology

Answer: C

Question: Which of these careers would a student studying biotechnology most likely pursue?
Answer:


Question: Which is the best source of vitamins and minerals?

Choices:
A. fruits and vegetables
B. bread, rice, and pasta
C. milk and milk products
D. meat, fish, and poultry

Answer: A

Question: Which is the best source of vitamins and minerals?
Answer:


Question: Camouflage MOST helps an animal with which of these life needs?

Choices:
A. Finding shelter
B. Hiding from predators
C. Gathering enough food
D. Raising young

Answer: B

Question: Camouflage MOST helps an animal with which of these life needs?
Answer:


Question: Some astronauts may spend several months in space orbiting Earth. Where do these astronauts most likely stay while in space?

Choices:
A. on a space station
B. in a space shuttle
C. on a space probe
D. in a lunar module

Answer: A

Question: Some astronauts may spend several months in space orbiting Earth. Where do these astronauts most likely stay while in space?
Answer:


Question: When water changes from a liquid to a gas and then the steam condenses back to the liquid form, these types of changes are

Choices:
A. physical.
B. chemical.
C. electrical.
D. mechanical.

Answer: A

Question: When water changes from a liquid to a gas and then the steam condenses back to the liquid form, these types of changes are
Answer:


Question: Which instrument would be best for measuring the volume of a pebble?

Choices:
A. metric ruler
B. stopwatch
C. triple beam balance
D. graduated cylinder

Answer: D

Question: Which instrument would be best for measuring the volume of a pebble?
Answer:


Question: Plants use carbon dioxide from the atmosphere during the process of

Choices:
A. respiration.
B. fertilization.
C. evaporation.
D. photosynthesis.

Answer: D

Question: Plants use carbon dioxide from the atmosphere during the process of
Answer:


Question: What happens to the water vapor in an air mass as it ascends?

Choices:
A. It freezes.
B. It condenses.
C. It vaporizes.
D. It polarizes.

Answer: B

Question: What happens to the water vapor in an air mass as it ascends?
Answer:


Question: A student organizes a list of the distances that five students ran in 10 minutes. Another way to best organize this data is by using a

Choices:
A. pie graph.
B. bar graph.
C. line graph.
D. pictograph.

Answer: B

Question: A student organizes a list of the distances that five students ran in 10 minutes. Another way to best organize this data is by using a
Answer:


Question: Some runners ate pasta before a race. The pasta was broken down into simple sugars and was absorbed by the blood stream. What body system was responsible for breaking down the pasta into small nutrients for use in the cells of the runners?

Choices:
A. the nervous system
B. the digestive system
C. the excretory system
D. the endocrine system

Answer: B

Question: Some runners ate pasta before a race. The pasta was broken down into simple sugars and was absorbed by the blood stream. What body system was responsible for breaking down the pasta into small nutrients for use in the cells of the runners?
Answer:


Question: Trevor turns on a lamp. When the lamp is on, electrical energy changes into which other form of energy?

Choices:
A. chemical
B. light
C. mechanical
D. potential

Answer: B

Question: Trevor turns on a lamp. When the lamp is on, electrical energy changes into which other form of energy?
Answer:


Question: Which material is the best conductor of electricity?

Choices:
A. metal
B. glass
C. wood
D. plastic

Answer: A

Question: Which material is the best conductor of electricity?
Answer:


Question: Mrs. Garry's class wants to know if their area has more acid rain than other parts of the state. Which would be the best way for them to begin research?

Choices:
A. contact other schools within the state
B. study science textbooks in the library
C. look for current acid rain studies on the Internet
D. examine soil samples taken at different locations

Answer: C

look for current acid rain studies on the Internet

Question: Mrs. Garry's class wants to know if their area has more acid rain than other parts of the state. Which would be the best way for them to begin research?
Answer:


Question: In areas where a lot of earthquakes occur, architects are designing buildings with the ability to move with the land. How are the new building designs most likely to help people?

Choices:
A. The new designs can help save lives.
B. The new designs are more attractive.
C. The new designs cost less to make.
D. The new designs are much taller.

Answer: A

Question: In areas where a lot of earthquakes occur, architects are designing buildings with the ability to move with the land. How are the new building designs most likely to help people?
Answer:


Question: Which organs belong to the lymphatic system?

Choices:
A. lungs, trachea
B. spleen, thymus
C. kidneys, bladder
D. pancreas, pituitary gland

Answer: B

Question: Which organs belong to the lymphatic system?
Answer:


Question: A small town is building their first water treatment plant. Their primary disinfectant is UV radiation. Which contaminant will UV radiation eliminate?

Choices:
A. bacteria
B. metals
C. sediment
D. oil

Answer: A

Question: A small town is building their first water treatment plant. Their primary disinfectant is UV radiation. Which contaminant will UV radiation eliminate?
Answer:


Question: Which of these substances is correctly identified as a mineral?

Choices:
A. coal
B. quartz
C. granite
D. sandstone

Answer: B

Question: Which of these substances is correctly identified as a mineral?
Answer:


Question: Which statement best describes the size of the Sun?

Choices:
A. The Sun is medium-sized compared to other stars.
B. The Sun is the largest and brightest star in the universe.
C. Most of the stars in the universe would fit inside the Sun.
D. Most of the stars in the universe are smaller than the Sun.

Answer: A

The Sun is medium-sized compared to other stars.

Question: Which statement best describes the size of the Sun?
Answer:


Question: An earthworm has a length of 12.8 centimeters. What is the length, in millimeters, of the earthworm?

Choices:
A. 0.128 millimeter
B. 1.28 millimeters
C. 128 millimeters
D. 1280 millimeters

Answer: C

Question: An earthworm has a length of 12.8 centimeters. What is the length, in millimeters, of the earthworm?
Answer:


Question: What property of water is most important for living organisms?

Choices:
A. It is odorless.
B. It does not conduct electricity.
C. It is tasteless.
D. It is liquid at most temperatures on Earth.

Answer: D

It is liquid at most temperatures on Earth.

Question: What property of water is most important for living organisms?
Answer:


Question: What remains in the same location in the sky of the Northern Hemisphere each night?

Choices:
A. the Sun
B. the Little Dipper
C. the North Star
D. the Moon

Answer: C

Question: What remains in the same location in the sky of the Northern Hemisphere each night?
Answer:


Question: Which is most directly responsible for building up a river delta?

Choices:
A. erosion
B. leaching
C. subsidence
D. deposition

Answer: D

Question: Which is most directly responsible for building up a river delta?
Answer:


Question: A carpenter rubs sandpaper on a wooden bench to make the bench smoother. The sandpaper will get warm as it is rubbed on the bench. As a result of the friction between the sandpaper and the bench, thermal energy is converted to

Choices:
A. chemical energy that is stored by the sandpaper.
B. radiant energy that is transferred to the bench.
C. potential energy that is stored by the wood.
D. heat energy that is transferred to the air.

Answer: D

heat energy that is transferred to the air.

Question: A carpenter rubs sandpaper on a wooden bench to make the bench smoother. The sandpaper will get warm as it is rubbed on the bench. As a result of the friction between the sandpaper and the bench, thermal energy is converted to
Answer:


Question: Canadian physician Sir William Osler once said, "In Science the credit goes to the man who convinces the world, not to the man to whom the idea first occurred." How does this quote apply to scientific knowledge?

Choices:
A. Famous scientists have the best ideas.
B. Ideas must be communicated to the public
C. In order to be important, ideas must be believable.
D. The results are less important than the ideas in an experiment.

Answer: B

Ideas must be communicated to the public

Question: Canadian physician Sir William Osler once said, "In Science the credit goes to the man who convinces the world, not to the man to whom the idea first occurred." How does this quote apply to scientific knowledge?
Answer:


Question: A researcher's plan is to place five fish in separate tanks, give them the same amount of food each day, and keep the temperature the same. One fish will be exposed to artificial light for 24 hours each day, while the others will have light for 22 hours and then no light for 2 hours each day. Which is the control for this experiment?

Choices:
A. the separate tanks
B. the amount of food
C. the fish deprived of light
D. the fish exposed to light for 24 hours

Answer: D

Question: A researcher's plan is to place five fish in separate tanks, give them the same amount of food each day, and keep the temperature the same. One fish will be exposed to artificial light for 24 hours each day, while the others will have light for 22 hours and then no light for 2 hours each day. Which is the control for this experiment?
Answer:


Question: All matter is made up of

Choices:
1. cells
2. atoms
3. molecules
4. compounds

Answer: 2

Question: All matter is made up of
Answer:


Question: If a cell is exposed to a chemical that inhibits the production of spindle fibers as the cell is preparing for mitosis, what would most likely happen?

Choices:
A. The cell would continue with mitotic division.
B. The cell would undergo meiotic division.
C. The cell would break open.
D. The cell would not divide.

Answer: D

Question: If a cell is exposed to a chemical that inhibits the production of spindle fibers as the cell is preparing for mitosis, what would most likely happen?
Answer:


Question: Some cells, such as human nerve and muscle cells, contain many more mitochondria than do other cells, such as skin cells. Why do some cells have more mitochondria than others?

Choices:
A. The cells use more energy.
B. The cells store more nutrients.
C. The cells degrade more proteins.
D. The cells divide more frequently.

Answer: A

Question: Some cells, such as human nerve and muscle cells, contain many more mitochondria than do other cells, such as skin cells. Why do some cells have more mitochondria than others?
Answer:


Question: Which of the following do plants need to make their own food?

Choices:
A. Flowers
B. Bacteria
C. Sunlight
D. Oxygen

Answer: C

Question: Which of the following do plants need to make their own food?
Answer:


Question: Iron oxide, also known as rust, is formed when iron chemically combines with oxygen. Which term best describes iron oxide?

Choices:
A. element
B. mixture
C. solution
D. compound

Answer: D

Question: Iron oxide, also known as rust, is formed when iron chemically combines with oxygen. Which term best describes iron oxide?
Answer:


Question: The process of cellular respiration occurs in

Choices:
A. both plant and animal cells.
B. plant cells only.
C. animal cells only.
D. neither plant nor animal cells.

Answer: A

Question: The process of cellular respiration occurs in
Answer:


Question: Sodium (Na) and chlorine (Cl) are two reactive and dangerous elements. Chlorine is a halogen gas that can cause respiratory damage and sodium is an alkali metal that reacts violently with water. What happens to the properties of sodium and chlorine when they react to form sodium chloride (NaCl), common table salt?

Choices:
A. The properties of both sodium and chlorine change.
B. The properties of both sodium and chlorine remain the same.
C. The properties of sodium are different but chlorine remains a dangerous gas.
D. The properties of sodium remain the same but the properties of chlorine change.

Answer: A

The properties of both sodium and chlorine change.

Question: Sodium (Na) and chlorine (Cl) are two reactive and dangerous elements. Chlorine is a halogen gas that can cause respiratory damage and sodium is an alkali metal that reacts violently with water. What happens to the properties of sodium and chlorine when they react to form sodium chloride (NaCl), common table salt?
Answer:


Question: Which statement about gravity is written as a law?

Choices:
A. The reason gravity works is because masses bend time and space.
B. The effect of gravity on plants might be reduced if certain minerals are added to the soil.
C. The force of gravity between two objects depends upon their masses and the distance between them.
D. The experiments being done on gravity today are better than what were done in the past and a full understanding is only a few years away.

Answer: C

The force of gravity between two objects depends upon their masses and the distance between them.

Question: Which statement about gravity is written as a law?
Answer:


Question: Some students have gathered a collection of rock samples from the school yard to study. They scraped the rocks against a piece of quartz from the school lab. Which property of minerals are the students investigating?

Choices:
A. texture
B. hardness
C. color
D. streak

Answer: B

Question: Some students have gathered a collection of rock samples from the school yard to study. They scraped the rocks against a piece of quartz from the school lab. Which property of minerals are the students investigating?
Answer:


Question: What causes day and night on Earth?

Choices:
A. Earth's rotation on its axis
B. the Sun's revolution around Earth
C. Earth's revolution around the Sun
D. the Sun's rotation on its axis

Answer: A

Question: What causes day and night on Earth?
Answer:


Question: Which is the order of the planets from closest to the Sun to farthest from the Sun?

Choices:
A. Mercury, Venus, Earth, Mars
B. Mars, Mercury, Earth, Venus
C. Earth, Venus, Mercury, Mars
D. Venus, Earth, Mars, Mercury

Answer: A

Question: Which is the order of the planets from closest to the Sun to farthest from the Sun?
Answer:


Question: Joyce put 200 milliliters of water in a beaker, put a thermometer in it, and heated it until it started to boil. She recorded a temperature of 100°C when it started to boil. She repeated the process with 400 milliliters of water. What would be the temperature when this second sample started to boil?

Choices:
A. twice as high as the first sample's
B. slightly higher than the first sample's
C. half as high as the first sample's
D. the same as the first sample's

Answer: D

Question: Joyce put 200 milliliters of water in a beaker, put a thermometer in it, and heated it until it started to boil. She recorded a temperature of 100°C when it started to boil. She repeated the process with 400 milliliters of water. What would be the temperature when this second sample started to boil?
Answer:


Question: Which of these shows the correct order needed for a solar eclipse to happen?

Choices:
A. Sun, Earth, Moon
B. Sun, Moon, Earth
C. Moon, Sun, Earth
D. Moon, Earth, Sun

Answer: B

Question: Which of these shows the correct order needed for a solar eclipse to happen?
Answer:


Question: Which of the following structures enables fish to remain at a certain depth without expending energy through swimming?

Choices:
A. swim bladder
B. lateral line
C. dorsal fin
D. gill slits

Answer: A

Question: Which of the following structures enables fish to remain at a certain depth without expending energy through swimming?
Answer:


Question: Machines are often full of moving parts that rub against each other. In machines, a lubricant such as oil is often applied to these moving parts. Why is this oil necessary?

Choices:
A. to enhance the effectiveness of friction
B. to increase the efficiency of the machine
C. to provide an additional source of energy
D. to produce more thermal energy on the machine

Answer: B

to increase the efficiency of the machine

Question: Machines are often full of moving parts that rub against each other. In machines, a lubricant such as oil is often applied to these moving parts. Why is this oil necessary?
Answer:


Question: As a result of human activity, many lakes in Florida have increased levels of nutrients that support algal growth. These algae grow very rapidly, then die and decompose. What impact does this overgrowth of algae most likely have on the lake ecosystem?

Choices:
A. The number of fish species increases.
B. The volume of lake water increases.
C. The buildup of bottom sediments decreases.
D. The amount of dissolved oxygen decreases.

Answer: D

The amount of dissolved oxygen decreases.

Question: As a result of human activity, many lakes in Florida have increased levels of nutrients that support algal growth. These algae grow very rapidly, then die and decompose. What impact does this overgrowth of algae most likely have on the lake ecosystem?
Answer:


Question: What happens when an animal hibernates?

Choices:
A. There is no life in any of its parts.
B. It stops breathing.
C. Its temperature is higher than when it is active.
D. It is absorbing energy for use when it is active.
E. It is using less energy than when it is active.

Answer: E

It is using less energy than when it is active.

Question: What happens when an animal hibernates?
Answer:


Question: In the water cycle, where does water go after reaching the ocean?

Choices:
A. The water flows into a river.
B. The water falls from the clouds.
C. The water sinks to the ocean floor.
D. The water changes into water vapor.

Answer: D

Question: In the water cycle, where does water go after reaching the ocean?
Answer:


Question: Over time, iron becomes rust when it combines with water and oxygen. Which type of change must occur for rust to form?

Choices:
A. chemical
B. mechanical
C. nuclear
D. physical

Answer: A

Question: Over time, iron becomes rust when it combines with water and oxygen. Which type of change must occur for rust to form?
Answer:


Question: An earthquake occurs in western Nevada. What most likely causes the earthquake?

Choices:
A. stress due to the movement of Earth's crustal plates
B. gravitational variation due to the Moon's orbit around Earth
C. temperature variation due to Earth's orbit around the Sun
D. rotational imbalance due to changes in the location of Earth's poles

Answer: A

stress due to the movement of Earth's crustal plates

Question: An earthquake occurs in western Nevada. What most likely causes the earthquake?
Answer:


Question: Rock layers with sand-sized particles were most likely deposited by

Choices:
A. wind.
B. water.
C. glaciers.
D. landslides.

Answer: A

Question: Rock layers with sand-sized particles were most likely deposited by
Answer:


Question: Which equation summarizes the process of respiration?

Choices:
A. water + carbon dioxide + energy -> sugar + oxygen
B. oxygen + sugar -> carbon dioxide + water + energy
C. carbon dioxide + oxygen + water -> sugar + energy
D. sugar + carbon dioxide + energy -> oxygen + water

Answer: B

oxygen + sugar -> carbon dioxide + water + energy

Question: Which equation summarizes the process of respiration?
Answer:


Question: Which of these occurs when the North Pole is tilted toward the Sun and the United States has the most daylight hours of the year?

Choices:
A. summer solstice
B. winter solstice
C. spring equinox
D. fall equinox

Answer: A

Question: Which of these occurs when the North Pole is tilted toward the Sun and the United States has the most daylight hours of the year?
Answer:


Question: Which property of sugar remains after sugar is dissolved in water?

Choices:
A. color
B. taste
C. shape
D. texture

Answer: B

Question: Which property of sugar remains after sugar is dissolved in water?
Answer:


Question: A student walks to school each morning in Maine. It is dark outside when he begins walking. As the days pass, the student notices the mornings are becoming brighter. The Sun is rising earlier each day. He also notices that there is more daylight after school. The Sun is setting later in the day. Which change of seasons is occurring?

Choices:
A. winter to spring
B. summer to fall
C. spring to winter
D. fall to winter

Answer: A

Question: A student walks to school each morning in Maine. It is dark outside when he begins walking. As the days pass, the student notices the mornings are becoming brighter. The Sun is rising earlier each day. He also notices that there is more daylight after school. The Sun is setting later in the day. Which change of seasons is occurring?
Answer:


Question: Which of these groups would be most concerned with technological developments in insect control?

Choices:
A. paleontologists
B. archaeologists
C. agriculturists
D. meteorologists

Answer: C

Question: Which of these groups would be most concerned with technological developments in insect control?
Answer:


Question: Some wasp species lay their eggs inside living caterpillars. As the eggs mature, they use the caterpillar as a food resource. Eventually, the wasp larvae hatch out of the caterpillar. This type of relationship is best described as

Choices:
A. predator-prey.
B. parasitic.
C. mutualistic.
D. commensalistic.

Answer: B

Question: Some wasp species lay their eggs inside living caterpillars. As the eggs mature, they use the caterpillar as a food resource. Eventually, the wasp larvae hatch out of the caterpillar. This type of relationship is best described as
Answer:


Question: Two fossils of the same species were found on two different continents. The continents are separated by the Atlantic Ocean. Scientists dated the fossils to be 2 million years old. Which is the least likely explanation for these findings?

Choices:
A. A great land bridge once connected the continents.
B. The remains were carried by ocean currents.
C. A single landmass once existed with both continents.
D. The animals swam across the ocean.

Answer: B

The remains were carried by ocean currents.

Question: Two fossils of the same species were found on two different continents. The continents are separated by the Atlantic Ocean. Scientists dated the fossils to be 2 million years old. Which is the least likely explanation for these findings?
Answer:


Question: When coal burns, the reaction

Choices:
A. releases heat and is endothermic.
B. releases heat and is exothermic.
C. absorbs heat and is endothermic.
D. absorbs heat and is exothermic.

Answer: B

Question: When coal burns, the reaction
Answer:


Question: A student plans to measure the thermal expansion of a strip of metal as it is heated from 0ºC to 50ºC. Which piece of equipment should he use to measure the expansion?

Choices:
A. a ruler
B. a balance
C. a compass
D. a protractor

Answer: A

Question: A student plans to measure the thermal expansion of a strip of metal as it is heated from 0ºC to 50ºC. Which piece of equipment should he use to measure the expansion?
Answer:


Question: What is the primary function of white blood cells in humans?

Choices:
A. carry oxygen
B. fight disease
C. grow tissues
D. remove waste

Answer: B

Question: What is the primary function of white blood cells in humans?
Answer:


Question: Which process is a cause of variation in a species?

Choices:
1. metamorphosis
2. cellular respiration
3. sexual reproduction
4. regulation

Answer: 3

Question: Which process is a cause of variation in a species?
Answer: