Question: Which statement best explains why photosynthesis is the foundation of most food webs?

Choices:
A. Sunlight is the source of energy for nearly all ecosystems.
B. Most ecosystems are found on land instead of in water.
C. Carbon dioxide is more available than other gases.
D. The producers in all ecosystems are plants.

Answer: A

Sunlight is the source of energy for nearly all ecosystems.

Question: Which statement best explains why photosynthesis is the foundation of most food webs?
Answer:


Question: Plants use sunlight to make

Choices:
A. soil.
B. minerals.
C. food.
D. water.

Answer: C

Question: Plants use sunlight to make
Answer:


Question: As global temperatures increase, certain organisms will be more affected than others. The changes associated with global warming may result in an increase in sea level. Which organisms will be affected most as a result of the change in sea level?

Choices:
A. birds that eat fish from shallow waters
B. fish that live in coral reefs in shallow waters
C. mammals that swim in cold, deep ocean waters
D. crustaceans at the bottom of deep sea ocean waters

Answer: B

fish that live in coral reefs in shallow waters

Question: As global temperatures increase, certain organisms will be more affected than others. The changes associated with global warming may result in an increase in sea level. Which organisms will be affected most as a result of the change in sea level?
Answer:


Question: Jessica wants to see cells in an oak tree leaf. Which tool is best for Jessica to use to see the cells?

Choices:
A. binoculars
B. microscope
C. reading glasses
D. magnifying glass

Answer: B

Question: Jessica wants to see cells in an oak tree leaf. Which tool is best for Jessica to use to see the cells?
Answer:


Question: Marshall learned that plants need a substance from the air to make their own food. What does a plant take from the air in the presence of sunlight?

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

Answer: A

Question: Marshall learned that plants need a substance from the air to make their own food. What does a plant take from the air in the presence of sunlight?
Answer:


Question: Which scientist is credited with discovering the first four moons of Jupiter?

Choices:
A. Galileo Galilei
B. Albert Einstein
C. Charles Darwin
D. Sir Isaac Newton

Answer: A

Question: Which scientist is credited with discovering the first four moons of Jupiter?
Answer:


Question: On a career day at school, an X-ray technician discusses her daily work with the class. Which equipment would she most likely say she uses on a regular basis to help ensure the safety of patients?

Choices:
A. earplugs
B. rubber gloves
C. goggles
D. lead aprons

Answer: D

Question: On a career day at school, an X-ray technician discusses her daily work with the class. Which equipment would she most likely say she uses on a regular basis to help ensure the safety of patients?
Answer:


Question: A doorbell circuit converts electrical energy into mechanical energy. The mechanical energy is in the form of vibrations that ultimately produce

Choices:
A. chemical energy.
B. thermal energy.
C. radiant energy.
D. sound energy.

Answer: D

Question: A doorbell circuit converts electrical energy into mechanical energy. The mechanical energy is in the form of vibrations that ultimately produce
Answer:


Question: In a classroom demonstration, a teacher pours sulfuric acid on some granulated sugar in a beaker. The sugar turns yellow and then black. Smoke rises and a strong smell is released. This demonstration is an example of what kind of change?

Choices:
A. chemical
B. physical
C. magnetic
D. electric

Answer: A

Question: In a classroom demonstration, a teacher pours sulfuric acid on some granulated sugar in a beaker. The sugar turns yellow and then black. Smoke rises and a strong smell is released. This demonstration is an example of what kind of change?
Answer:


Question: Erin wants to make a strong, light chair. Which natural material should she use?

Choices:
A. iron
B. granite
C. clay
D. wood

Answer: D

Question: Erin wants to make a strong, light chair. Which natural material should she use?
Answer:


Question: The cycle of night and day on Earth is a result of

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

Answer: D

Question: The cycle of night and day on Earth is a result of
Answer:


Question: Clownfish take shelter in the tentacles of sea anemones and keep sea anemones clean. Which type of relationship does this represent?

Choices:
A. parasitism
B. commensalism
C. mutualism
D. neutralism

Answer: C

Question: Clownfish take shelter in the tentacles of sea anemones and keep sea anemones clean. Which type of relationship does this represent?
Answer:


Question: Scientists have discovered organisms that thrive in hot water that is 90°C (194°F) and do not need sunlight or oxygen to live. Into which kingdom would the scientists classify these organisms?

Choices:
A. Archaebacteria
B. Fungi
C. Plantae
D. Protista

Answer: A

Question: Scientists have discovered organisms that thrive in hot water that is 90°C (194°F) and do not need sunlight or oxygen to live. Into which kingdom would the scientists classify these organisms?
Answer:


Question: Which statement describes how the umbilical cord supports a developing fetus?

Choices:
A. It provides a protective barrier between the mother and the fetus.
B. It keeps the fetus inside the mother until birth.
C. It provides a navel when the baby is born.
D. It supplies oxygen and nutrients to the fetus.

Answer: D

It supplies oxygen and nutrients to the fetus.

Question: Which statement describes how the umbilical cord supports a developing fetus?
Answer:


Question: Animals give off carbon dioxide that plants take in through leaves. What do plants give off as a result of photosynthesis that animals need to breathe?

Choices:
A. heat
B. oxygen
C. protein
D. water

Answer: B

Question: Animals give off carbon dioxide that plants take in through leaves. What do plants give off as a result of photosynthesis that animals need to breathe?
Answer:


Question: The speed and general direction of motion of a galaxy relative to the Earth can be determined by

Choices:
A. measuring its red shift.
B. the gravity it exerts.
C. contrasting it against nearby stars.
D. observing its motion across the sky.

Answer: A

Question: The speed and general direction of motion of a galaxy relative to the Earth can be determined by
Answer:


Question: The construction of Hoover Dam on the Colorado River resulted in abundant freshwater and electrical power for the region. Which of these is a disadvantage of the construction of Hoover Dam?

Choices:
A. an increase in flooding downstream
B. an increase in regional humidity
C. a decrease in the amount of river ecosystems
D. a decrease in the amount of water for irrigation

Answer: C

a decrease in the amount of river ecosystems

Question: The construction of Hoover Dam on the Colorado River resulted in abundant freshwater and electrical power for the region. Which of these is a disadvantage of the construction of Hoover Dam?
Answer:


Question: When both a dominant and recessive gene are present, which of the following is true?

Choices:
A. The dominant trait will be visible.
B. The recessive trait will be visible.
C. Neither trait will be visible.
D. It cannot be predicted which trait will be visible.

Answer: A

Question: When both a dominant and recessive gene are present, which of the following is true?
Answer:


Question: Leather basketballs are made for indoor use on smooth surfaces. Rubber basketballs are made for use on many different surfaces. Which of the following properties of rubber makes it better than leather for use on many different surfaces?

Choices:
A. Rubber is durable.
B. Rubber is lightweight.
C. Rubber is dark in color.
D. Rubber is quickly produced.

Answer: A

Question: Leather basketballs are made for indoor use on smooth surfaces. Rubber basketballs are made for use on many different surfaces. Which of the following properties of rubber makes it better than leather for use on many different surfaces?
Answer:


Question: Which of these events is an example of a change in climate?

Choices:
A. Afternoon clouds form and block the sunlight.
B. A series of tornadoes occurs over a one-week period.
C. An overnight temperature drop causes frost to form.
D. The average amount of annual precipitation decreases.

Answer: D

The average amount of annual precipitation decreases.

Question: Which of these events is an example of a change in climate?
Answer:


Question: What repeating cycle is responsible for the four seasons that occur on Earth?

Choices:
A. rotation of the moon
B. rotation of the Sun
C. revolution of the sun in the galaxy
D. revolution of the earth about the sun

Answer: D

Question: What repeating cycle is responsible for the four seasons that occur on Earth?
Answer:


Question: Which theory states that the universe originated as a single mass?

Choices:
A. Big Bang
B. Steady State
C. Astronomical
D. Catastrophism

Answer: A

Question: Which theory states that the universe originated as a single mass?
Answer:


Question: Lions tend to prey on primary consumers like zebras and gazelles. If there were a sudden decline in a population of lions, which ecological imbalance would most likely occur in the habitat?

Choices:
A. overgrazing
B. eutrophication
C. invasion by non-native species
D. overproduction of greenhouse gases

Answer: A

Question: Lions tend to prey on primary consumers like zebras and gazelles. If there were a sudden decline in a population of lions, which ecological imbalance would most likely occur in the habitat?
Answer:


Question: In a laboratory procedure, students added sodium hydroxide crystals to a beaker of water and allowed the resulting solution to cool. Based on this information, which type of chemical process most likely occurred?

Choices:
A. electrical
B. energetic
C. exothermic
D. endothermic

Answer: C

Question: In a laboratory procedure, students added sodium hydroxide crystals to a beaker of water and allowed the resulting solution to cool. Based on this information, which type of chemical process most likely occurred?
Answer:


Question: What information about stars can be learned by using a spectrometer?

Choices:
A. chemical composition
B. distance from Earth
C. size
D. speed

Answer: A

Question: What information about stars can be learned by using a spectrometer?
Answer:


Question: In what form do plants store the energy produced from sunlight?

Choices:
A. radiant
B. thermal
C. chemical
D. mechanical

Answer: C

Question: In what form do plants store the energy produced from sunlight?
Answer:


Question: Elements are organized on the periodic table according to

Choices:
A. electronegativity values.
B. atomic mass.
C. atomic number.
D. the number of neutrons.

Answer: C

Question: Elements are organized on the periodic table according to
Answer:


Question: Which source produces light from nuclear energy?

Choices:
A. the Sun
B. a stove burner
C. the Moon
D. a light bulb

Answer: A

Question: Which source produces light from nuclear energy?
Answer:


Question: The United States government limits the use of certain pesticides through laws passed in the Endangered Species Protection Program. Which is the most likely reason to enforce laws that limit pesticide use?

Choices:
A. Some pesticides are expensive.
B. Some pesticides fail to control insects.
C. Some pesticides give off foul odors.
D. Some pesticides can harm non-targeted species.

Answer: D

Some pesticides can harm non-targeted species.

Question: The United States government limits the use of certain pesticides through laws passed in the Endangered Species Protection Program. Which is the most likely reason to enforce laws that limit pesticide use?
Answer:


Question: Sal is looking at a map of Massachusetts. He has measured the distance, in inches, from Boston to Salem on the map. He wants to know how many actual miles the inches represent. What feature of the map should he look for?

Choices:
A. key
B. scale
C. legend
D. compass

Answer: B

Question: Sal is looking at a map of Massachusetts. He has measured the distance, in inches, from Boston to Salem on the map. He wants to know how many actual miles the inches represent. What feature of the map should he look for?
Answer:


Question: Where are the active volcanoes most likely to be found?

Choices:
A. where rivers form
B. where tectonic plates meet
C. where oceans are deepest
D. where land and water meet

Answer: B

Question: Where are the active volcanoes most likely to be found?
Answer:


Question: Photosynthesis and respiration are both parts of which cycle?

Choices:
A. carbon cycle
B. nitrogen cycle
C. phosphorous cycle
D. rock cycle

Answer: A

Question: Photosynthesis and respiration are both parts of which cycle?
Answer:


Question: The crews of two boats at sea can communicate with each other by shouting. Why is it impossible for the crews of two spaceships a similar distance apart in space to do this?

Choices:
A. The sound is reflected more in space.
B. The pressure is too high inside the spaceships.
C. The spaceships are traveling faster than sound.
D. There is no air in space for the sound to travel through.

Answer: D

There is no air in space for the sound to travel through.

Question: The crews of two boats at sea can communicate with each other by shouting. Why is it impossible for the crews of two spaceships a similar distance apart in space to do this?
Answer:


Question: Which of these is a threat to the survival of an ecosystem?

Choices:
A. predator-prey population cycles
B. less biomass at higher levels of the food web
C. a shrinking variety of animal and plant species
D. competition among some consumer populations

Answer: C

a shrinking variety of animal and plant species

Question: Which of these is a threat to the survival of an ecosystem?
Answer:


Question: The teeth of a carnivore are MOSTLY -

Choices:
A. pointed
B. rounded
C. wide
D. flat

Answer: A

Question: The teeth of a carnivore are MOSTLY -
Answer:


Question: Gregor Mendel contributed to the study of biology by the careful, objective study of

Choices:
A. heredity.
B. bacteria.
C. pedigrees.
D. environment.

Answer: A

Question: Gregor Mendel contributed to the study of biology by the careful, objective study of
Answer:


Question: Scientists are able to correlate time and the amount of difference between homologous genes when studying the divergence of two species because scientists have reliable estimates for which value?

Choices:
A. rate of genetic mutations
B. survival benefit of specific genes
C. pressure of selection on base pairs
D. number of bases in species' genomes

Answer: A

Question: Scientists are able to correlate time and the amount of difference between homologous genes when studying the divergence of two species because scientists have reliable estimates for which value?
Answer:


Question: Which of the following colors of visible light has the longest wavelength?

Choices:
A. red
B. blue
C. green
D. orange

Answer: A

Question: Which of the following colors of visible light has the longest wavelength?
Answer:


Question: As a river enters a larger body of water, sediments are deposited over a wide area. Which of these landforms is likely to be formed at the site of deposition?

Choices:
A. Cave
B. Mountain
C. Delta
D. Valley

Answer: C

Question: As a river enters a larger body of water, sediments are deposited over a wide area. Which of these landforms is likely to be formed at the site of deposition?
Answer:


Question: Energy appears in many forms. What form of energy is lightning?

Choices:
A. electrical energy
B. mechanical energy
C. magnetic energy
D. sound energy

Answer: A

Question: Energy appears in many forms. What form of energy is lightning?
Answer:


Question: Often organisms seem similar in their outward appearances. For example, a porpoise and a shark seem closely related, but they are not. Such similarity is the result of

Choices:
A. convergent evolution.
B. adaptive radiation.
C. artificial selection.
D. genetic equilibrium.

Answer: A

Question: Often organisms seem similar in their outward appearances. For example, a porpoise and a shark seem closely related, but they are not. Such similarity is the result of
Answer:


Question: At camp, Raj sees a lightning storm. He sees the lightning before he hears the thunder. What does this show?

Choices:
A. Light moves faster than sound
B. Light moves slower than sound
C. Light and sound move at the same speed

Answer: A

Question: At camp, Raj sees a lightning storm. He sees the lightning before he hears the thunder. What does this show?
Answer:


Question: Aristotle taught that a force was always required to keep an object moving. Which of the following states what Newton believed?

Choices:
A. Aristotle was correct.
B. Aristotle was correct for objects on Earth but not in space.
C. An object will keep moving unless an unbalanced force stops it.
D. A moving object will eventually stop even though an unbalanced force keeps pushing on it.

Answer: C

An object will keep moving unless an unbalanced force stops it.

Question: Aristotle taught that a force was always required to keep an object moving. Which of the following states what Newton believed?
Answer:


Question: A stationary air mass over the Gulf of Mexico would typically be

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

Answer: B

Question: A stationary air mass over the Gulf of Mexico would typically be
Answer:


Question: Which form of energy is in firewood?

Choices:
A. light
B. sound
C. kinetic
D. potential

Answer: D

Question: Which form of energy is in firewood?
Answer:


Question: The Statue of Liberty was built in France and then taken apart into 350 pieces for shipping. When the pieces arrived in New York, the statue was put together. Which statement describes the relationship between the mass of the 350 pieces and the mass of the whole statue?

Choices:
A. The mass of the pieces is greater than the mass of the statue.
B. The mass of the pieces is the same as the mass of the statue.
C. The mass of the statue is greater than the mass of the pieces.
D. The mass of the statue is not related to the mass of the pieces.

Answer: B

The mass of the pieces is the same as the mass of the statue.

Question: The Statue of Liberty was built in France and then taken apart into 350 pieces for shipping. When the pieces arrived in New York, the statue was put together. Which statement describes the relationship between the mass of the 350 pieces and the mass of the whole statue?
Answer:


Question: Which is the correct order in the process of sedimentary rock formation?

Choices:
A. compaction, erosion, cementation, deposition
B. compaction, weathering, erosion, cementation
C. weathering, deposition, cementation, burial
D. weathering, erosion, deposition, compaction

Answer: D

weathering, erosion, deposition, compaction

Question: Which is the correct order in the process of sedimentary rock formation?
Answer:


Question: Classification of galaxies is based on which characteristic?

Choices:
A. the color of the galaxy
B. the shape of the galaxy
C. how many stars make up the galaxy
D. how many planets make up the galaxy

Answer: B

Question: Classification of galaxies is based on which characteristic?
Answer:


Question: Which reflects light?

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

Answer: A


Question: Why is the light year often used to describe distances between objects in the universe?

Choices:
A. because of the way planets reflect light
B. because of the great number of bright stars
C. because of the way objects rotate and revolve
D. because of the large distance between objects in space

Answer: D

because of the large distance between objects in space

Question: Why is the light year often used to describe distances between objects in the universe?
Answer:


Question: Materials made of the same substance will have characteristics in common. Which property is most likely to remain constant in different samples of the same material?

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

Answer: A

Question: Materials made of the same substance will have characteristics in common. Which property is most likely to remain constant in different samples of the same material?
Answer:


Question: A Raleigh man turned on his kitchen faucet and filled a glass with water. When he looked at the water, he thought that it might not be safe to drink, so he called the water company to find out. What factor did the man use to evaluate the safety of the water?

Choices:
A. pH
B. turbidity
C. nitrate concentration
D. phosphate concentration

Answer: B

Question: A Raleigh man turned on his kitchen faucet and filled a glass with water. When he looked at the water, he thought that it might not be safe to drink, so he called the water company to find out. What factor did the man use to evaluate the safety of the water?
Answer:


Question: A bright object with a long tail of glowing gases is in orbit around the Sun. This object is most likely

Choices:
1. a planet
2. a star
3. an asteroid
4. a comet

Answer: 4

Question: A bright object with a long tail of glowing gases is in orbit around the Sun. This object is most likely
Answer:


Question: A growing community relies on a nearby lake to provide fresh water for drinking and bathing. An increase in the use of fresh water will cause the lake to become

Choices:
A. colder
B. deeper
C. larger
D. smaller

Answer: D

Question: A growing community relies on a nearby lake to provide fresh water for drinking and bathing. An increase in the use of fresh water will cause the lake to become
Answer:


Question: What is needed to change ice into water?

Choices:
A. air
B. energy
C. stirring
D. chemicals

Answer: B

Question: What is needed to change ice into water?
Answer:


Question: How do word processors on computers benefit most students?

Choices:
A. It makes them understand how to write a good story.
B. It helps them gather historical information.
C. It exposes them to data that is hard to find.
D. It allows them to edit papers quickly.

Answer: D

Question: How do word processors on computers benefit most students?
Answer:


Question: Use of nuclear fuel would most likely reduce human contributions to which environmental problem?

Choices:
A. ozone thinning
B. landfill creation
C. shoreline erosion
D. greenhouse heating

Answer: D

Question: Use of nuclear fuel would most likely reduce human contributions to which environmental problem?
Answer:


Question: What process makes it possible for the nutrients from organic material to be added to soil?

Choices:
A. weathering
B. erosion
C. decomposition
D. succession

Answer: C

Question: What process makes it possible for the nutrients from organic material to be added to soil?
Answer:


Question: Animals get energy from eating food that comes from plants. Plants survive by taking in substances that are released by animals. What substance do animals release that plants take in?

Choices:
A. carbon dioxide
B. oxygen
C. salt
D. sugar

Answer: A

Question: Animals get energy from eating food that comes from plants. Plants survive by taking in substances that are released by animals. What substance do animals release that plants take in?
Answer:


Question: Which pieces of equipment would be used to measure the density of a solution?

Choices:
A. a ruler and a protractor
B. a magnet and a thermometer
C. a graduated cylinder and a balance
D. an Erlenmeyer flask and a Bunsen burner

Answer: C

Question: Which pieces of equipment would be used to measure the density of a solution?
Answer:


Question: Which of the following is the best conductor of heat?

Choices:
A. oven mitts
B. a metal bowl
C. a wooden spoon
D. rubber soled shoes

Answer: B

Question: Which of the following is the best conductor of heat?
Answer:


Question: Scientists determined that cabbages grown using Fertilizer A grew bigger than cabbages grown using Fertilizer B or no fertilizer at all. The scientists repeated the investigation and produced the same results. Which best explains the purpose of repeating this investigation?

Choices:
A. to ensure that the cabbages are safe for human consumption
B. to discover the scientific principle that causes the increased growth
C. to confirm that the observed differences were caused by the fertilizer
D. to determine the difference between the experimental and control groups

Answer: C

to confirm that the observed differences were caused by the fertilizer

Question: Scientists determined that cabbages grown using Fertilizer A grew bigger than cabbages grown using Fertilizer B or no fertilizer at all. The scientists repeated the investigation and produced the same results. Which best explains the purpose of repeating this investigation?
Answer:


Question: A company wants to make a game that uses a magnet that sticks to a board. Which material should it use for the board?

Choices:
A. cardboard
B. glass
C. steel
D. wood

Answer: C

Question: A company wants to make a game that uses a magnet that sticks to a board. Which material should it use for the board?
Answer:


Question: While performing an experiment involving four different clear liquids, a student forgets to label the test tubes. What should the student do?

Choices:
A. try to identify the liquids by smell
B. ask another student to identify the liquids
C. ask the teacher how to dispose of the liquids
D. continue the experiment with the unidentified liquids

Answer: C

ask the teacher how to dispose of the liquids

Question: While performing an experiment involving four different clear liquids, a student forgets to label the test tubes. What should the student do?
Answer:


Question: Which human body systems work together to send messages?

Choices:
A. muscular and skeletal
B. nervous and endocrine
C. excretory and digestive
D. circulatory and respiratory

Answer: B

Question: Which human body systems work together to send messages?
Answer:


Question: Students collect pond water in their beakers. Which is the best unit of measurement for the volume of water they collect?

Choices:
A. Grams
B. Meters
C. Milliliters
D. Centimeters

Answer: C

Question: Students collect pond water in their beakers. Which is the best unit of measurement for the volume of water they collect?
Answer:


Question: Science students investigated the cause of the different phases of the moon. The model that would best demonstrate the cause of the phases of the moon would include representations of

Choices:
A. the moon and Earth
B. the moon and the sun
C. the moon, the sun, and Earth
D. the moon, the sun, and Venus

Answer: C

Question: Science students investigated the cause of the different phases of the moon. The model that would best demonstrate the cause of the phases of the moon would include representations of
Answer:


Question: Which of the following is a function of the digestive system of the human body?

Choices:
A. carrying oxygen to the lungs
B. sending signals from the brain to the spinal cord
C. breaking down food into nutrients
D. providing support for the body

Answer: C

Question: Which of the following is a function of the digestive system of the human body?
Answer:


Question: Many birds avoid eating the viceroy butterfly because it looks like the monarch butterfly. Monarch butterflies contain a substance that makes the birds sick when monarchs are eaten. The development of the pattern of the viceroy butterfly to look like the monarch butterfly is an example of

Choices:
A. camouflage.
B. coloration.
C. diversity.
D. mimicry.

Answer: D

Question: Many birds avoid eating the viceroy butterfly because it looks like the monarch butterfly. Monarch butterflies contain a substance that makes the birds sick when monarchs are eaten. The development of the pattern of the viceroy butterfly to look like the monarch butterfly is an example of
Answer:


Question: What is the most important thing a cylinder, a measuring cup, and a beaker all have in common?

Choices:
A. They all hold liquids.
B. They can all be made of glass.
C. They can all be marked in milliliters.
D. They can all be used to measure the volume of a liquid.

Answer: D

They can all be used to measure the volume of a liquid.

Question: What is the most important thing a cylinder, a measuring cup, and a beaker all have in common?
Answer:


Question: A large amount of oil was spilled in a lake environment. Within a few weeks, the number of plants and animals living in the area where the oil was spilled will most likely

Choices:
A. decrease
B. increase
C. remain the same

Answer: A

Question: A large amount of oil was spilled in a lake environment. Within a few weeks, the number of plants and animals living in the area where the oil was spilled will most likely
Answer:


Question: Which of the following organisms would most likely get its food energy only from consumers?

Choices:
A. deer
B. grass
C. hawk
D. mushroom

Answer: C

Question: Which of the following organisms would most likely get its food energy only from consumers?
Answer:


Question: Scientists think that the rise in global temperature during the last one hundred years is due to an increase of carbon dioxide in the atmosphere. Which question would best help scientists assess the claim that humans are responsible for the rising global temperature?

Choices:
A. What is the mechanism by which carbon dioxide heats Earth?
B. What is the source of most of the carbon dioxide in the atmosphere?
C. What is the source of the increase of carbon dioxide in the atmosphere?
D. What is the increase in the concentration of carbon dioxide in the atmosphere?

Answer: C

What is the source of the increase of carbon dioxide in the atmosphere?

Question: Scientists think that the rise in global temperature during the last one hundred years is due to an increase of carbon dioxide in the atmosphere. Which question would best help scientists assess the claim that humans are responsible for the rising global temperature?
Answer:


Question: Which series correctly represents the levels of organization in an organism?

Choices:
A. cells -> organs -> organ system -> tissue
B. cells -> tissue -> organs -> organ system
C. tissue -> cells -> organ system -> organs
D. tissue -> organ system -> cells -> organs

Answer: B

cells -> tissue -> organs -> organ system

Question: Which series correctly represents the levels of organization in an organism?
Answer:


Question: What happens when a warm object is put inside a cooler object?

Choices:
A. The warm object loses energy and the cool object gains energy so that both objects stay at different temperatures.
B. The warm object gains energy and the cool object loses energy so that both objects stay at different temperatures.
C. The warm object loses energy and the cool object gains energy until both objects are the same temperature.
D. The warm object gains energy and the cool object loses energy until both objects are the same temperature.

Answer: C

The warm object loses energy and the cool object gains energy until both objects are the same temperature.

Question: What happens when a warm object is put inside a cooler object?
Answer:


Question: In 1921, Earl Dickson invented a bandage after he noticed his wife was unable to easily cover cuts on her hands. He covered the bandage with a chemical that sealed it so air would not enter the cut. How did solving this problem benefit others medically?

Choices:
A. People relied on bandages more than doctors.
B. The bandages cured cuts that were infected.
C. The bandages helped keep cuts clean.
D. People cut themselves less often.

Answer: C

Question: In 1921, Earl Dickson invented a bandage after he noticed his wife was unable to easily cover cuts on her hands. He covered the bandage with a chemical that sealed it so air would not enter the cut. How did solving this problem benefit others medically?
Answer:


Question: A group of cells performing the same function in the body is called

Choices:
A. a tissue.
B. an organelle.
C. an organism.
D. a system.

Answer: A

Question: A group of cells performing the same function in the body is called
Answer:


Question: What renewable energy source used to make electricity is thought to be always available?

Choices:
A. oil
B. coal
C. wind
D. nuclear

Answer: C

Question: What renewable energy source used to make electricity is thought to be always available?
Answer:


Question: Calcium is a mineral that helps make your bones and teeth strong. Which of these foods is the best source of calcium?

Choices:
A. candy
B. rice
C. cheese
D. meat

Answer: C

Question: Calcium is a mineral that helps make your bones and teeth strong. Which of these foods is the best source of calcium?
Answer:


Question: What is the main difference between planets and moons in our solar system?

Choices:
A. All planets can support life; moons cannot.
B. All planets have atmospheres; moons do not.
C. All planets orbit the Sun; all moons orbit planets.
D. All planets are larger than all moons.

Answer: C

All planets orbit the Sun; all moons orbit planets.

Question: What is the main difference between planets and moons in our solar system?
Answer:


Question: A computer model of an insect population takes into account the following parameters: * available food resources * annual temperature variation * timing of insect reproductive cycles Which additional parameter would most significantly improve the model's accuracy when predicting the insect population size?

Choices:
A. decomposers recycling dead insects
B. annual variation in oxygen availability
C. activities of predators preying on insects
D. variation in barometric pressure

Answer: C

activities of predators preying on insects

Question: A computer model of an insect population takes into account the following parameters: * available food resources * annual temperature variation * timing of insect reproductive cycles Which additional parameter would most significantly improve the model's accuracy when predicting the insect population size?
Answer:


Question: Sheri went on a field trip with her class and saw a stream with floating garbage. How could this pollution affect humans?

Choices:
A. There may not be enough drinking water.
B. There may not be enough water in the water cycle.
C. There may not be enough oxygen for humans to breathe.

Answer: A

Question: Sheri went on a field trip with her class and saw a stream with floating garbage. How could this pollution affect humans?
Answer:


Question: During freezing, melting, and boiling, water changes from one state to another state. Heat needs to be supplied for which of these to take place?

Choices:
A. boiling only
B. melting only
C. melting and freezing but not boiling
D. melting and boiling but not freezing

Answer: D

Question: During freezing, melting, and boiling, water changes from one state to another state. Heat needs to be supplied for which of these to take place?
Answer:


Question: Why do the Sun and Moon appear to move across the sky?

Choices:
A. The rotation of the solar system makes the Sun and Moon seem to move.
B. The rotation of Earth makes the Sun and Moon seem to move.
C. The Sun and Moon revolve around Earth.
D. Earth revolves around the Sun and the Moon.

Answer: B

The rotation of Earth makes the Sun and Moon seem to move.

Question: Why do the Sun and Moon appear to move across the sky?
Answer:


Question: Which structure do a rabbit cell and a bacillus cell have in common?

Choices:
A. mitochondrion
B. capsule
C. nucleus
D. DNA

Answer: D

Question: Which structure do a rabbit cell and a bacillus cell have in common?
Answer:


Question: Most species of ducks have webbed feet. The webbed feet are an example of

Choices:
A. behavioral trait.
B. a learned trait.
C. an inherited trait.
D. an instinctive trait.

Answer: C

Question: Most species of ducks have webbed feet. The webbed feet are an example of
Answer:


Question: Which parts of an atom are reactive during a chemical process?

Choices:
A. electrons
B. protons
C. neutrons
D. molecules

Answer: A

Question: Which parts of an atom are reactive during a chemical process?
Answer:


Question: The human brain is an organ that is made up of many tissues. This information can be used to determine that the brain is

Choices:
A. unicellular.
B. multicellular.
C. part of a bacterial colony.
D. able to function independently.

Answer: B

Question: The human brain is an organ that is made up of many tissues. This information can be used to determine that the brain is
Answer:


Question: The piping plover is a bird that builds its nest on sand dunes along the Atlantic Ocean. Which of these actions most likely damages the nests of the piping plover?

Choices:
A. people fishing from a boat
B. children playing in the ocean waves
C. children digging holes along the sand dunes
D. people walking on a sidewalk along the sand dunes

Answer: C

children digging holes along the sand dunes

Question: The piping plover is a bird that builds its nest on sand dunes along the Atlantic Ocean. Which of these actions most likely damages the nests of the piping plover?
Answer:


Question: There is a shadow under a tree. Which form of energy must be present for the shadow to occur?

Choices:
A. heat
B. light
C. sound
D. mechanical

Answer: B

Question: There is a shadow under a tree. Which form of energy must be present for the shadow to occur?
Answer:


Question: Neurons respond to stimuli and transmit impulses to coordinate body functions. Which of these indicates the rapid change in the membrane potential when a neuron is stimulated?

Choices:
A. action potential
B. resting potential
C. refractory period
D. threshold period

Answer: A

Question: Neurons respond to stimuli and transmit impulses to coordinate body functions. Which of these indicates the rapid change in the membrane potential when a neuron is stimulated?
Answer:


Question: An earthworm was placed on top of a thick layer of moist topsoil in a pan. The pan was placed in a room with the lights on. How did the earthworm most likely respond to these conditions?

Choices:
A. by burrowing under the soil
B. by crawling around in the pan
C. by staying where it was placed
D. by trying to crawl out of the pan

Answer: A

Question: An earthworm was placed on top of a thick layer of moist topsoil in a pan. The pan was placed in a room with the lights on. How did the earthworm most likely respond to these conditions?
Answer:


Question: As Bobby entered a dark room, he pushed the switch on the wall to turn on the light. What makes the light turn on when Bobby pushes the switch?

Choices:
A. electricity
B. friction
C. gravity
D. magnetism

Answer: A

Question: As Bobby entered a dark room, he pushed the switch on the wall to turn on the light. What makes the light turn on when Bobby pushes the switch?
Answer:


Question: What is the smallest part of a gold ring that is still gold?

Choices:
A. an atom
B. an electron
C. a molecule
D. a compound

Answer: A

Question: What is the smallest part of a gold ring that is still gold?
Answer:


Question: Which gas is the most abundant in Earth's atmosphere?

Choices:
A. oxygen
B. nitrogen
C. water vapor
D. carbon dioxide

Answer: B

Question: Which gas is the most abundant in Earth's atmosphere?
Answer:


Question: The water cycle requires energy. The main source of energy for the water cycle is

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

Answer: C

Question: The water cycle requires energy. The main source of energy for the water cycle is
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 the 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 the second sample started to boil?
Answer:


Question: A thermometer shows that the outside air temperature is colder than the temperature at which water turns to ice. However, ice on the sidewalk melts. What probably caused this?

Choices:
A. The air heating the sidewalk
B. The sidewalk reflecting sunlight into the air
C. The wind causing the ice on the sidewalk to melt
D. The sunlight making the sidewalk warmer than the air

Answer: D

The sunlight making the sidewalk warmer than the air

Question: A thermometer shows that the outside air temperature is colder than the temperature at which water turns to ice. However, ice on the sidewalk melts. What probably caused this?
Answer:


Question: In a lab, a bacterial strain shows resistance to an antibiotic. The presence of the antibiotic allows an existing variant within the genetic code to help the bacteria survive. The resistance of bacteria due to an existing genetic variant can be best described as which process?

Choices:
A. natural selection
B. selective breeding
C. asexual reproduction
D. behavioral adaptation

Answer: A

Question: In a lab, a bacterial strain shows resistance to an antibiotic. The presence of the antibiotic allows an existing variant within the genetic code to help the bacteria survive. The resistance of bacteria due to an existing genetic variant can be best described as which process?
Answer:


Question: The human immunodeficiency virus (HIV) causes AIDS. The first known human cases AIDS were in Africa in the late 1950s. Since then, tens of millions of people have died from the disease, and tens of millions more people all over the world are infected. Which term best describes the disease AIDS?

Choices:
A. isolated cases
B. outbreak
C. epidemic
D. pandemic

Answer: D

Question: The human immunodeficiency virus (HIV) causes AIDS. The first known human cases AIDS were in Africa in the late 1950s. Since then, tens of millions of people have died from the disease, and tens of millions more people all over the world are infected. Which term best describes the disease AIDS?
Answer:


Question: A student prepared the following list of characteristics about a cellular organelle. present in animal cells present in plant cells helps make energy available to the cell Which of the following cellular structures is the student describing?

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

Answer: C

Question: A student prepared the following list of characteristics about a cellular organelle. present in animal cells present in plant cells helps make energy available to the cell Which of the following cellular structures is the student describing?
Answer:


Question: Liquid cooking oil was poured into a container. Which statement best describes a property of the cooking oil after it was poured into the container?

Choices:
A. Its color changed.
B. Its mass increased.
C. Its volume stayed the same.
D. Its temperature quickly increased.

Answer: C

Question: Liquid cooking oil was poured into a container. Which statement best describes a property of the cooking oil after it was poured into the container?
Answer:


Question: In a recycling program, people can separate paper from their other trash. The paper is sent to factories and turned into new products. What does paper recycling help conserve the most?

Choices:
A. air
B. gasoline
C. trees
D. water

Answer: C

Question: In a recycling program, people can separate paper from their other trash. The paper is sent to factories and turned into new products. What does paper recycling help conserve the most?
Answer:


Question: Which sequence identifies the levels of organization of body structures in a human from simplest to most complex?

Choices:
1. cell -> organ -> tissue -> organ system
2. organ system -> cell -> tissue -> organ
3. tissue -> organ -> organ system -> cell
4. cell -> tissue -> organ -> organ system

Answer: 4

Question: Which sequence identifies the levels of organization of body structures in a human from simplest to most complex?
Answer:


Question: Which statement describes the transfer of energy when an ice cube is placed in a cup of hot tea?

Choices:
A. Heat flows from the tea to the ice.
B. Cold flows from the ice to the tea.
C. Cold flows from the ice, and heat flows from the tea.
D. Heat flows simultaneously between the ice and the tea.

Answer: A

Question: Which statement describes the transfer of energy when an ice cube is placed in a cup of hot tea?
Answer:


Question: The universe is believed to be approximately 14 billion years old. As a result of gravitational attraction, which most likely developed first after the Big Bang?

Choices:
A. a planet
B. a comet
C. a moon
D. a star

Answer: D

Question: The universe is believed to be approximately 14 billion years old. As a result of gravitational attraction, which most likely developed first after the Big Bang?
Answer:


Question: Compost piles have many parts, such as leaves, moisture, vegetables, and microorganisms. Which part of a compost pile breaks down materials and adds nutrients to the soil?

Choices:
A. leaves
B. moisture
C. vegetables
D. microorganisms

Answer: D

Question: Compost piles have many parts, such as leaves, moisture, vegetables, and microorganisms. Which part of a compost pile breaks down materials and adds nutrients to the soil?
Answer:


Question: Organisms contribute to the water cycle mainly through the process of

Choices:
A. irrigation.
B. evaporation.
C. precipitation.
D. transpiration.

Answer: D

Question: Organisms contribute to the water cycle mainly through the process of
Answer:


Question: In which state are molecules of a substance arranged in the most orderly way?

Choices:
A. gas
B. liquid
C. plasma
D. solid

Answer: D

Question: In which state are molecules of a substance arranged in the most orderly way?
Answer:


Question: Which energy source is nonrenewable?

Choices:
1. sunlight
2. biomass
3. wind
4. fossil fuel

Answer: 4

Question: Which energy source is nonrenewable?
Answer:


Question: Minerals are used for making many things including jewelry, chalk, and concrete. Where do we get the minerals needed to make these things?

Choices:
A. from air
B. from wood
C. from rocks
D. from crops

Answer: C

Question: Minerals are used for making many things including jewelry, chalk, and concrete. Where do we get the minerals needed to make these things?
Answer:


Question: Scientists studying migrating birds and homing pigeons have discovered that they navigate by monitoring differences in the intensity and inclination of Earth's magnetic field. Special cells in bird beaks can detect these changes as the birds fly over Earth's surface. Which metal did the scientists find in the cells that birds use as a magnetometer?

Choices:
A. iron
B. gold
C. mercury
D. aluminum

Answer: A

Question: Scientists studying migrating birds and homing pigeons have discovered that they navigate by monitoring differences in the intensity and inclination of Earth's magnetic field. Special cells in bird beaks can detect these changes as the birds fly over Earth's surface. Which metal did the scientists find in the cells that birds use as a magnetometer?
Answer:


Question: Scientists use ice cores to identify and explain previous climatic trends. By correlating climatic conditions recorded in the ice, with solid, nonsnow particles also found in the ice, scientists can help to predict the climatic impact of which phenomena?

Choices:
A. atmospheric carbon dioxide concentration changes
B. radioactive decay rate changes in the outer core
C. volcanic eruptions
D. magnetic pole reversals

Answer: C

Question: Scientists use ice cores to identify and explain previous climatic trends. By correlating climatic conditions recorded in the ice, with solid, nonsnow particles also found in the ice, scientists can help to predict the climatic impact of which phenomena?
Answer:


Question: The wind helps many plants reproduce by ___.

Choices:
A. cooling the plants
B. giving the plants moisture
C. spreading the plants' pollen
D. strengthening the plants' root systems

Answer: C

Question: The wind helps many plants reproduce by ___.
Answer:


Question: Approximately 14,000 years ago, the climate in North America began to warm rapidly. At the same time, human hunters migrated to the continent. Which of these most likely resulted from a combination of these two factors?

Choices:
A. a reduction in the rate of species change
B. an increase in the rate of large mammal extinctions
C. an increase in the amount of interspecies cooperation
D. a reduction in the total number of small parasitic insects

Answer: B

an increase in the rate of large mammal extinctions

Question: Approximately 14,000 years ago, the climate in North America began to warm rapidly. At the same time, human hunters migrated to the continent. Which of these most likely resulted from a combination of these two factors?
Answer:


Question: With the development of the microscope, scientists were able to see cells for the first time. Why was it difficult to view cells without a microscope?

Choices:
A. Cells are small.
B. Cells are alive.
C. Cells move quickly.
D. Cells have an electrical charge.

Answer: A

Question: With the development of the microscope, scientists were able to see cells for the first time. Why was it difficult to view cells without a microscope?
Answer:


Question: What happens to a moist air mass as it moves upward in the atmosphere?

Choices:
A. It becomes warmer and forms clouds.
B. It becomes cooler and forms clouds.
C. Its temperature remains the same.
D. Its temperature varies greatly.

Answer: B

Question: What happens to a moist air mass as it moves upward in the atmosphere?
Answer:


Question: Which list describes the particles that make up an atom?

Choices:
A. nucleus, electrons, and quarks
B. protons, neutron, and electrons
C. ionic bonds, covalent bonds, and ions
D. nucleus, electron cloud, and energy levels

Answer: B

Question: Which list describes the particles that make up an atom?
Answer:


Question: Which type of energy does a radiator give off ?

Choices:
A. heat
B. light
C. solar
D. electrical

Answer: A

Question: Which type of energy does a radiator give off ?
Answer:


Question: Which food contains the highest percentage of protein?

Choices:
A. rice
B. dates
C. carrots
D. chicken

Answer: D

Question: Which food contains the highest percentage of protein?
Answer:


Question: Copper (Cu) reacts with oxygen (O) to form copper oxide (CuO). The properties of CuO are most likely

Choices:
A. different from copper or oxygen.
B. similar to both copper and oxygen.
C. similar only to copper.
D. similar only to oxygen.

Answer: A

Question: Copper (Cu) reacts with oxygen (O) to form copper oxide (CuO). The properties of CuO are most likely
Answer:


Question: A group of scientists is studying the effect of cell phone signals on honeybees. Before starting the investigation, the scientists stated that the bees exposed to cell phone signals will have difficulty finding their way back to the hive. Which term best describes the statement made by the group of scientists?

Choices:
A. control
B. data
C. hypothesis
D. variable

Answer: C

Question: A group of scientists is studying the effect of cell phone signals on honeybees. Before starting the investigation, the scientists stated that the bees exposed to cell phone signals will have difficulty finding their way back to the hive. Which term best describes the statement made by the group of scientists?
Answer:


Question: Which of the following best explains why the pressure inside a high-flying airplane must be controlled?

Choices:
A. At high altitudes there is greater atmospheric pressure than on the surface of the Earth.
B. At high altitudes there is lower atmospheric pressure than on the surface of the Earth.
C. If the cabin is not pressurized, ozone and other upper atmospheric gases will enter the airplane.
D. If the cabin is not pressurized, carbon dioxide will escape from the airplane.

Answer: B

At high altitudes there is lower atmospheric pressure than on the surface of the Earth.

Question: Which of the following best explains why the pressure inside a high-flying airplane must be controlled?
Answer:


Question: Which is considered a property of soil?

Choices:
A. streak
B. fracture
C. texture
D. luster

Answer: C

Question: Which is considered a property of soil?
Answer:


Question: Atoms of the same element can have different atomic masses because they can have different numbers of

Choices:
A. neutrons.
B. protons.
C. electrons.
D. neutrinos.

Answer: A

Question: Atoms of the same element can have different atomic masses because they can have different numbers of
Answer:


Question: Earthquakes are vibrations of Earth's crust. What device is used to measure the size of an earthquake?

Choices:
A. barometer
B. Doppler radar
C. depth scale
D. seismograph

Answer: D

Question: Earthquakes are vibrations of Earth's crust. What device is used to measure the size of an earthquake?
Answer:


Question: Which is an example of water condensing? 1.

Choices:
A. puddle disappearing on a hot summer afternoon
B. Sweat forming on your forehead after you do a lot of exercise
C. Ice cubes melting when you put them out in the sun
D. Dew forming on plants during a cold night

Answer: D

Dew forming on plants during a cold night

Question: Which is an example of water condensing? 1.
Answer:


Question: Which of the following is the most basic need for a plant?

Choices:
A. shade
B. heat
C. water
D. sand

Answer: C

Question: Which of the following is the most basic need for a plant?
Answer:


Question: During exercise, the cardiovascular system works together with the respiratory system to

Choices:
A. maintain blood pressure.
B. remove carbon dioxide.
C. produce red blood cells.
D. filter out waste products.

Answer: B

Question: During exercise, the cardiovascular system works together with the respiratory system to
Answer:


Question: The area of a small ocean island is slowly shrinking. This is most likely the result of which occurrence?

Choices:
A. plant growth
B. beach erosion
C. dissolving rock
D. falling water

Answer: B

Question: The area of a small ocean island is slowly shrinking. This is most likely the result of which occurrence?
Answer:


Question: A student dissolves a spoonful of sugar in a glass of water and makes a

Choices:
A. solute.
B. solvent.
C. solution.
D. suspension.

Answer: C

Question: A student dissolves a spoonful of sugar in a glass of water and makes a
Answer:


Question: Which must be present in order for something to be classified as an organism?

Choices:
A. nucleus
B. organ
C. cell
D. organelle

Answer: C

Question: Which must be present in order for something to be classified as an organism?
Answer:


Question: Use the information below to answer the question. Cotton is a plant product used to make fabric. Cotton is made of cellulose, a fiber not digestible by humans. Cellulose is composed of many sugar molecules bonded together into long chains. Each sugar molecule contains carbon, hydrogen, and oxygen atoms. When cotton fabric is washed, wrinkles often form. The clothing industry uses chemicals to manufacture some cotton fabrics that are wrinkle-free. Dyes are also added to color the cellulose fibers in cotton. A feature that is common to both cellulose and sugar is that both are

Choices:
A. magnetic
B. elements
C. compounds
D. soluble in water

Answer: C

Question: Use the information below to answer the question. Cotton is a plant product used to make fabric. Cotton is made of cellulose, a fiber not digestible by humans. Cellulose is composed of many sugar molecules bonded together into long chains. Each sugar molecule contains carbon, hydrogen, and oxygen atoms. When cotton fabric is washed, wrinkles often form. The clothing industry uses chemicals to manufacture some cotton fabrics that are wrinkle-free. Dyes are also added to color the cellulose fibers in cotton. A feature that is common to both cellulose and sugar is that both are
Answer:


Question: In certain areas, tectonic plates move over hot spots. Which landforms are most likely associated with these hot spots?

Choices:
A. trenches
B. volcanoes
C. island arcs
D. mid-ocean ridges

Answer: B

Question: In certain areas, tectonic plates move over hot spots. Which landforms are most likely associated with these hot spots?
Answer:


Question: The loudness of sound can be changed by

Choices:
A. decreasing the pitch.
B. increasing the frequency.
C. increasing the amplitude.
D. decreasing the wavelength.

Answer: C

Question: The loudness of sound can be changed by
Answer:


Question: Which location on Earth receives the most direct sunlight?

Choices:
A. the deserts
B. the South Pole
C. the equator
D. the Western Hemisphere

Answer: C

Question: Which location on Earth receives the most direct sunlight?
Answer:


Question: Which behavior will best help a student stay healthy?

Choices:
A. watching television five hours a day
B. sleeping three hours each night
C. eating fruits and vegetables each day
D. exercising once a month

Answer: C

Question: Which behavior will best help a student stay healthy?
Answer:


Question: Which structural characteristic is present in a paramecium that is not present in an amoeba?

Choices:
A. pellicle
B. cell wall
C. cytoplasm
D. cytoskeleton

Answer: A

Question: Which structural characteristic is present in a paramecium that is not present in an amoeba?
Answer:


Question: A student places soil in a plastic container to make a home for some worms. The student cuts holes in the top of the container because the worms need

Choices:
A. space to move
B. air to breathe
C. sunlight to grow
D. sound to communicate

Answer: B

Question: A student places soil in a plastic container to make a home for some worms. The student cuts holes in the top of the container because the worms need
Answer:


Question: Which of the following do water (H2O), rust (Fe2O3), and salt (NaCl) have in common?

Choices:
A. Water, rust, and salt are atoms.
B. Water, rust, and salt are mixtures.
C. Water, rust, and salt are elements.
D. Water, rust, and salt are compounds.

Answer: D

Question: Which of the following do water (H2O), rust (Fe2O3), and salt (NaCl) have in common?
Answer:


Question: Which particles are responsible for the electric charge of an atom?

Choices:
A. protons and neutrons
B. protons and electrons
C. neutrons and molecules
D. molecules and electrons

Answer: B

Question: Which particles are responsible for the electric charge of an atom?
Answer:


Question: A scientist is studying the effect of acid rain on oak trees. Of the numbers below, which would be the number of oak trees the scientist should use to obtain the most reliable data?

Choices:
A. 1
B. 2
C. 20
D. 200

Answer: D

Question: A scientist is studying the effect of acid rain on oak trees. Of the numbers below, which would be the number of oak trees the scientist should use to obtain the most reliable data?
Answer:


Question: Meiosis is necessary for which reproductive event to occur?

Choices:
A. vegetative budding
B. binary fission
C. cloning
D. fertilization

Answer: D

Question: Meiosis is necessary for which reproductive event to occur?
Answer:


Question: Chloroplasts absorb light energy. The function of the chloroplast is to

Choices:
A. synthesize sugars.
B. synthesize proteins.
C. transform sugar into cellular energy.
D. transform proteins into useful nutrients.

Answer: A

Question: Chloroplasts absorb light energy. The function of the chloroplast is to
Answer:


Question: Fossils of sea animals were found in a cave in Arkansas. What does this mean about that area of Arkansas in the past?

Choices:
A. It was once underwater.
B. It was once much warmer.
C. It has become a rockier place.
D. It has changed little from then.

Answer: A

Question: Fossils of sea animals were found in a cave in Arkansas. What does this mean about that area of Arkansas in the past?
Answer:


Question: Which of these best describes a tornado?

Choices:
A. A winter storm that produces frozen precipitation
B. A rotating funnel-shaped cloud with strong winds and thunderstorms
C. A severe weather condition with low temperatures and blowing snow
D. A storm that forms over warm ocean water and has extremely strong winds

Answer: B

A rotating funnel-shaped cloud with strong winds and thunderstorms

Question: Which of these best describes a tornado?
Answer:


Question: The growing human population has many practices that adversely impact the environment. Acid rain is one example of environmental damage that is related to human activities. Which human activity is most likely the largest contributor to acid rain?

Choices:
A. burning fossil fuels in power plants
B. using pesticides on agricultural crops
C. dumping waste matter into ocean waters
D. clearing native forests for industrialization

Answer: A

Question: The growing human population has many practices that adversely impact the environment. Acid rain is one example of environmental damage that is related to human activities. Which human activity is most likely the largest contributor to acid rain?
Answer:


Question: Two samples of gold must have the same

Choices:
A. mass.
B. volume.
C. length.
D. density.

Answer: D

Question: Two samples of gold must have the same
Answer:


Question: Gravity is responsible for the ___.

Choices:
A. orbits of the planets around the Sun
B. rotation of a planet on its axis
C. tilt of Earth's axis
D. phases of the Moon

Answer: A

Question: Gravity is responsible for the ___.
Answer:


Question: The scientific method is the inquiry process by which scientists raise and attempt to answer new questions. Which is the best way to communicate findings that result from scientific inquiry?

Choices:
A. discuss the findings with scientists who agree with you
B. discuss the findings with a well-known scientist
C. publish the findings in scientific journals
D. publish the findings in local newspapers

Answer: C

publish the findings in scientific journals

Question: The scientific method is the inquiry process by which scientists raise and attempt to answer new questions. Which is the best way to communicate findings that result from scientific inquiry?
Answer:


Question: Some scientists believe that the mass extinction of dinosaurs was caused by the impact of a large meteorite on Earth. This impact would have caused a darkening of the sky due to dust blown into the upper atmosphere. This darkening would have reduced the sizes of some ecosystems because of

Choices:
A. longer seasons.
B. accelerated erosion.
C. reduced photosynthesis.
D. increased number of hurricanes.

Answer: C

Question: Some scientists believe that the mass extinction of dinosaurs was caused by the impact of a large meteorite on Earth. This impact would have caused a darkening of the sky due to dust blown into the upper atmosphere. This darkening would have reduced the sizes of some ecosystems because of
Answer:


Question: Which device is used to determine the volume of a liquid?

Choices:
A. anemometer
B. graduated cylinder
C. test tube
D. thermometer

Answer: B

Question: Which device is used to determine the volume of a liquid?
Answer:


Question: Which of the following fasteners are best to use to fasten the sides of a wooden birdhouse?

Choices:
A. bolts
B. hooks
C. nails
D. pins

Answer: C

Question: Which of the following fasteners are best to use to fasten the sides of a wooden birdhouse?
Answer:


Question: Rocks and minerals are common materials found on Earth. Which property do most rocks and minerals share?

Choices:
A. They are pure.
B. They are solid.
C. They are liquid.
D. They are magnetic.

Answer: B

Question: Rocks and minerals are common materials found on Earth. Which property do most rocks and minerals share?
Answer:


Question: The central nervous system consists of two parts: the brain and the

Choices:
A. senses.
B. organs.
C. muscles.
D. spinal cord.

Answer: D

Question: The central nervous system consists of two parts: the brain and the
Answer:


Question: Which organisms make energy available to all other organisms in a food chain?

Choices:
A. producers
B. decomposers
C. consumers
D. scavengers

Answer: A

Question: Which organisms make energy available to all other organisms in a food chain?
Answer:


Question: Which safety measure should a student take when handling a microscope?

Choices:
A. clean the lenses with your fingers
B. keep switching the magnifications
C. carry the microscope with two hands at all times
D. make sure to put the microscope on an uneven surface

Answer: C

carry the microscope with two hands at all times

Question: Which safety measure should a student take when handling a microscope?
Answer:


Question: Earthquakes and volcanic eruptions occur both on land and in water. Earthquakes and volcanic eruptions most often occur

Choices:
A. near plate boundaries
B. on large pieces of land
C. in large bodies of water
D. in regions near the equator

Answer: A

Question: Earthquakes and volcanic eruptions occur both on land and in water. Earthquakes and volcanic eruptions most often occur
Answer:


Question: Use the information below to answer the question. Cotton is a plant product used to make fabric. Cotton is made of cellulose, a fiber not digestible by humans. Cellulose is composed of many sugar molecules bonded together into long chains. Each sugar molecule contains carbon, hydrogen, and oxygen atoms. When cotton fabric is washed, wrinkles often form. The clothing industry uses chemicals to manufacture some cotton fabrics that are wrinkle-free. Dyes are also added to color the cellulose fibers in cotton. How would a clothing manufacturer separate colors to determine the purity of the dyes?

Choices:
A. through filtration
B. by their boiling points
C. by their freezing points
D. through paper chromatography

Answer: D

Question: Use the information below to answer the question. Cotton is a plant product used to make fabric. Cotton is made of cellulose, a fiber not digestible by humans. Cellulose is composed of many sugar molecules bonded together into long chains. Each sugar molecule contains carbon, hydrogen, and oxygen atoms. When cotton fabric is washed, wrinkles often form. The clothing industry uses chemicals to manufacture some cotton fabrics that are wrinkle-free. Dyes are also added to color the cellulose fibers in cotton. How would a clothing manufacturer separate colors to determine the purity of the dyes?
Answer:


Question: Students are investigating the physical properties of three solid mixtures by placing each solid mixture in liquid water. What physical property are the students testing?

Choices:
A. solubility
B. conductivity
C. boiling point
D. melting point

Answer: A

Question: Students are investigating the physical properties of three solid mixtures by placing each solid mixture in liquid water. What physical property are the students testing?
Answer:


Question: Raising livestock, such as sheep and cattle, results in the production of large amounts of methane gas (CH4). Methane has the same effect in the atmosphere as carbon dioxide (CO2). As more livestock are raised to provide food for humans, what is the most likely effect of the increase in methane?

Choices:
A. acid rain
B. ozone thinning
C. water pollution
D. global warming

Answer: D

Question: Raising livestock, such as sheep and cattle, results in the production of large amounts of methane gas (CH4). Methane has the same effect in the atmosphere as carbon dioxide (CO2). As more livestock are raised to provide food for humans, what is the most likely effect of the increase in methane?
Answer:


Question: The amount of which greenhouse gas in the air will increase the most if large forests are cut down to be used for building materials without planting new trees in their place?

Choices:
1. ozone
2. methane
3. water vapor
4. carbon dioxide

Answer: 4

Question: The amount of which greenhouse gas in the air will increase the most if large forests are cut down to be used for building materials without planting new trees in their place?
Answer:


Question: Professor Walden studies genetics at a local university. She believes that she has discovered information that contradicts a widely accepted theory. As a scientist and leader in the study of genetics, which action should she take?

Choices:
A. Announce to the world that her theory is better than the old theory.
B. Call the news media and tell them about her new theory.
C. Challenge the old theory with scientific evidence.
D. Request that the old theory be banned.

Answer: C

Challenge the old theory with scientific evidence.

Question: Professor Walden studies genetics at a local university. She believes that she has discovered information that contradicts a widely accepted theory. As a scientist and leader in the study of genetics, which action should she take?
Answer:


Question: Which factor has the greatest effect on a community's stores of freshwater?

Choices:
A. the location of the nearest ocean
B. the average annual rainfall
C. the location of the nearest mountain
D. the average winter temperature

Answer: B

Question: Which factor has the greatest effect on a community's stores of freshwater?
Answer:


Question: Proper use and care of a microscope includes

Choices:
A. carrying it with both hands.
B. reflecting sunlight to the stage.
C. removing the objectives after you are done.
D. adjusting the coarse focus under high power.

Answer: A

Question: Proper use and care of a microscope includes
Answer:


Question: Which wind-water interaction is responsible for cycling nutrient-rich waters from the ocean floor to the sea surface?

Choices:
A. upwelling
B. storm surge
C. downwelling
D. surface currents

Answer: A

Question: Which wind-water interaction is responsible for cycling nutrient-rich waters from the ocean floor to the sea surface?
Answer:


Question: What causes ocean water to evaporate in the water cycle?

Choices:
A. energy from the Sun
B. energy from ocean waves
C. energy from Earth's rotation
D. energy from Earth's moon

Answer: A

Question: What causes ocean water to evaporate in the water cycle?
Answer:


Question: A hypothesis that is successfully tested many times may become a

Choices:
A. conclusion.
B. theory.
C. constant.
D. law.

Answer: B

Question: A hypothesis that is successfully tested many times may become a
Answer:


Question: If a string on a musical instrument like a guitar is made tighter, the sound produced by that string will always be

Choices:
A. lower pitched.
B. higher pitched.
C. louder.
D. quieter.

Answer: B

Question: If a string on a musical instrument like a guitar is made tighter, the sound produced by that string will always be
Answer:


Question: In a genetics investigation, students used two red straws to represent male parent DNA. They used two green straws to represent female parent DNA. The offspring in this activity are best represented by

Choices:
A. either one red straw or one green straw.
B. two green straws.
C. two red straws.
D. one red straw and one green straw.

Answer: D

Question: In a genetics investigation, students used two red straws to represent male parent DNA. They used two green straws to represent female parent DNA. The offspring in this activity are best represented by
Answer:


Question: What two organ systems are involved in the transfer of oxygen to the cells from outside the body?

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

Answer: D

Question: What two organ systems are involved in the transfer of oxygen to the cells from outside the body?
Answer:


Question: Scientists are developing new satellite technology to help predict the weather. How will developing this technology most likely benefit people?

Choices:
A. It will show people that storms can be prevented.
B. It will show people that science is interesting.
C. It will help warn people about dangerous storms.
D. It will help people drive in the rain.

Answer: C

It will help warn people about dangerous storms.

Question: Scientists are developing new satellite technology to help predict the weather. How will developing this technology most likely benefit people?
Answer:


Question: Which device directly converts chemical energy into electrical energy?

Choices:
1. solar-powered calculator
2. wood-burning stove
3. battery-powered flashlight
4. wind-powered sailboat

Answer: 3

Question: Which device directly converts chemical energy into electrical energy?
Answer:


Question: Running to escape danger is an action that requires the nervous system to coordinate the interaction of which two body systems?

Choices:
1. digestive and endocrine
2. muscular and skeletal
3. reproductive and excretory
4. circulatory and digestive

Answer: 2

Question: Running to escape danger is an action that requires the nervous system to coordinate the interaction of which two body systems?
Answer:


Question: Matter is defined as anything that takes up space and has

Choices:
A. mass
B. texture
C. odor
D. color

Answer: A

Question: Matter is defined as anything that takes up space and has
Answer:


Question: A researcher is working on a family genetics project. She wants to trace a particular trait back through several generations of her ancestors. Which type of display will best help the researcher organize the information?

Choices:
A. flow chart
B. cycle diagram
C. pedigree chart
D. Punnett square

Answer: C

Question: A researcher is working on a family genetics project. She wants to trace a particular trait back through several generations of her ancestors. Which type of display will best help the researcher organize the information?
Answer:


Question: In the Northern Hemisphere, June 21st has more hours of sunlight than any other day. However, June 21st has the fewest hours of sunlight in the Southern Hemisphere. Which best explains why the Northern Hemisphere receives more daylight than the Southern Hemisphere on the same day?

Choices:
A. Earth rotates on its axis
B. Earth is tilted on its axis
C. The Sun moves closer to the Northern Hemisphere
D. The Sun releases more energy to the Northern Hemisphere

Answer: B

Question: In the Northern Hemisphere, June 21st has more hours of sunlight than any other day. However, June 21st has the fewest hours of sunlight in the Southern Hemisphere. Which best explains why the Northern Hemisphere receives more daylight than the Southern Hemisphere on the same day?
Answer:


Question: The western coast of the United States has been increasing in size for millions of years. Which process has added material to the western coast of the United States?

Choices:
A. deposition at transform boundaries
B. accretion at convergent boundaries
C. landslides at divergent boundaries
D. meteorite impact at convergent boundaries

Answer: B

Question: The western coast of the United States has been increasing in size for millions of years. Which process has added material to the western coast of the United States?
Answer:


Question: Scientists frequently monitor levels of microorganisms at beaches in the summer time. High temperatures, pollution, runoff, and illegal dumping all affect water quality. What do these scientific efforts illustrate?

Choices:
A. Pollution can be eliminated through water testing.
B. High temperatures increase runoff from agricultural fields.
C. Water testing identifies origination of illegal dumping.
D. Monitoring water quality is important to public health.

Answer: D

Monitoring water quality is important to public health.

Question: Scientists frequently monitor levels of microorganisms at beaches in the summer time. High temperatures, pollution, runoff, and illegal dumping all affect water quality. What do these scientific efforts illustrate?
Answer:


Question: Which of the following is composed of many cells?

Choices:
A. virus
B. bacterium
C. paramecium
D. plant

Answer: D

Question: Which of the following is composed of many cells?
Answer:


Question: The primary role of the endocrine system is to

Choices:
1. produce hormones that regulate body functions
2. form chemicals that destroy microbes
3. break down food to release nutrients
4. supply red blood cells to carry oxygen

Answer: 1

produce hormones that regulate body functions

Question: The primary role of the endocrine system is to
Answer:


Question: Fossil fuels were made from specific kinds of ancient organisms. The fossilized remains of tiny ocean organisms formed

Choices:
A. only coal.
B. only natural gas.
C. oil and coal.
D. oil and natural gas.

Answer: D

Question: Fossil fuels were made from specific kinds of ancient organisms. The fossilized remains of tiny ocean organisms formed
Answer:


Question: Fossil fuels were formed from

Choices:
A. uranium
B. sea water
C. sand and gravel
D. dead plants and animals

Answer: D

Question: Fossil fuels were formed from
Answer:


Question: One unique characteristic of water is that its specific heat

Choices:
A. can only be measured in calories.
B. is lower than other common substances.
C. is higher than other common substances.
D. requires little energy for a big temperature change.

Answer: C

Question: One unique characteristic of water is that its specific heat
Answer:


Question: In a forest, a brown-colored bird sits on a tree branch. How does the bird's brown color most likely help it survive in the forest?

Choices:
A. attracts insects for food
B. warns predators of its defense
C. hides it from predators
D. allows it to stay warm

Answer: C

Question: In a forest, a brown-colored bird sits on a tree branch. How does the bird's brown color most likely help it survive in the forest?
Answer:


Question: Carlos was playing on a slide on a sunny summer day. Which property of the slide tells Carlos how much energy the slide absorbed from the Sun?

Choices:
A. the mass
B. the color
C. the height
D. the temperature

Answer: D

Question: Carlos was playing on a slide on a sunny summer day. Which property of the slide tells Carlos how much energy the slide absorbed from the Sun?
Answer:


Question: A cyclist travels 3 km north in 25 minutes. What does this information describe?

Choices:
A. mass
B. force
C. motion
D. gravity

Answer: C

Question: A cyclist travels 3 km north in 25 minutes. What does this information describe?
Answer:


Question: Hector's class is counting the number of ducks in a pond. Hector counts a different number than the rest of the class. Which of the following actions should Hector most likely perform?

Choices:
A. keep the result
B. change the number he counted
C. think that the class results are wrong
D. remove his number from the class result

Answer: A

Question: Hector's class is counting the number of ducks in a pond. Hector counts a different number than the rest of the class. Which of the following actions should Hector most likely perform?
Answer:


Question: The engineering team that is designing a scientific research station on the Arctic permafrost has to provide the station with energy for cooking, heating, and lighting. Considering the fragile environment and other conditions there, the best choice is probably to

Choices:
A. build a wind turbine.
B. have fuel trucked in.
C. have a pipeline built.
D. build a solar collector.

Answer: A

Question: The engineering team that is designing a scientific research station on the Arctic permafrost has to provide the station with energy for cooking, heating, and lighting. Considering the fragile environment and other conditions there, the best choice is probably to
Answer:


Question: To study the effect of heat on plant growth, Andy divided ten identical seedlings into groups. She placed one group on a windowsill in the sun and the other group in a dark closet on the cool (north) side of the house. Think about the characteristics of a properly designed scientific experiment. What is wrong with the above experiment?

Choices:
A. The temperature difference between the two groups was not great enough.
B. The amount of light was different for the two groups.
C. One group of seedlings got less water than the other.
D. Nothing is wrong with the experiment.

Answer: B

The amount of light was different for the two groups.

Question: To study the effect of heat on plant growth, Andy divided ten identical seedlings into groups. She placed one group on a windowsill in the sun and the other group in a dark closet on the cool (north) side of the house. Think about the characteristics of a properly designed scientific experiment. What is wrong with the above experiment?
Answer:


Question: Dogs have some learned behaviors. Which is most likely a learned behavior in a dog?

Choices:
A. sniffing to find food
B. panting when it feels hot
C. chasing a squirrel up a tree
D. barking when it wants to go outside

Answer: D

Question: Dogs have some learned behaviors. Which is most likely a learned behavior in a dog?
Answer:


Question: Parents with freckles often have children with freckles. This occurs because

Choices:
A. freckles develop from light.
B. certain foods cause freckles.
C. certain habits cause freckles.
D. freckles are an inherited trait.

Answer: D

Question: Parents with freckles often have children with freckles. This occurs because
Answer:


Question: Many cities encourage people to recycle. The items that can be recycled are placed in a special container and picked up each week from people's homes. How does recycling most likely help the environment?

Choices:
A. Recycling reduces littering.
B. Recycling makes products last longer.
C. Recycling puts less trash in the city landfill.
D. Recycling increases the amount of dust in the air.

Answer: C

Recycling puts less trash in the city landfill.

Question: Many cities encourage people to recycle. The items that can be recycled are placed in a special container and picked up each week from people's homes. How does recycling most likely help the environment?
Answer:


Question: Which substance do all living things require to survive?

Choices:
1. blood
2. water
3. carbon dioxide
4. organic soil

Answer: 2

Question: Which substance do all living things require to survive?
Answer:


Question: Having dry, hot weather for a long time can cause a

Choices:
A. drought
B. thunderstorm
C. tornado
D. flood

Answer: A

Question: Having dry, hot weather for a long time can cause a
Answer:


Question: A scientist wants to collect several bird eggs on an island. She needs a case that will protect the eggs she collects. Which of the following cases would best protect the eggs?

Choices:
A. a hard metal case with flexible foam lining
B. a flexible metal case with smooth plastic lining
C. a strong wooden case with lightweight plastic lining
D. a lightweight wooden case with strong aluminum lining

Answer: A

a hard metal case with flexible foam lining

Question: A scientist wants to collect several bird eggs on an island. She needs a case that will protect the eggs she collects. Which of the following cases would best protect the eggs?
Answer:


Question: The Moon's surface is visible to an observer on Earth because the Moon

Choices:
1. reflects sunlight
2. absorbs light from Earth
3. produces its own light
4. transmits sunlight

Answer: 1

Question: The Moon's surface is visible to an observer on Earth because the Moon
Answer:


Question: When light is reflected off an object and enters the eye, it falls on the

Choices:
A. lens.
B. pupil.
C. retina.
D. cornea.

Answer: C

Question: When light is reflected off an object and enters the eye, it falls on the
Answer:


Question: A student pushes a box to slide it across the floor. Which statement explains why the box begins to move?

Choices:
A. The weight of the box is greater than the force of friction.
B. The weight of the box is less than the force of friction.
C. The applied force is greater than the force of friction.
D. The applied force is less than the force of friction.

Answer: C

The applied force is greater than the force of friction.

Question: A student pushes a box to slide it across the floor. Which statement explains why the box begins to move?
Answer:


Question: Which best describes construction technology?

Choices:
A. exchanging information electronically
B. changing raw materials into goods
C. building and finishing a structure
D. converting and transmitting energy

Answer: C

Question: Which best describes construction technology?
Answer:


Question: Which of the following makes up the smallest region in the electromagnetic spectrum?

Choices:
A. radio waves
B. infrared light
C. visible light
D. gamma rays

Answer: C

Question: Which of the following makes up the smallest region in the electromagnetic spectrum?
Answer:


Question: An organism that breaks down dead plants and animals, returning matter back into the soil, is called a

Choices:
A. herbivore.
B. producer.
C. competitor.
D. decomposer.

Answer: D

Question: An organism that breaks down dead plants and animals, returning matter back into the soil, is called a
Answer:


Question: Which of the following tools would be most useful in determining the length and width of a school cafeteria?

Choices:
A. scale
B. centimeter ruler
C. tape measure
D. thermometer

Answer: C

Question: Which of the following tools would be most useful in determining the length and width of a school cafeteria?
Answer:


Question: Which is most responsible for the uneven heating of the air in the atmosphere?

Choices:
A. radiation
B. convection
C. conduction
D. condensation

Answer: B

Question: Which is most responsible for the uneven heating of the air in the atmosphere?
Answer:


Question: A boy and his sister both play piano. Playing piano is an example of

Choices:
A. a physical change
B. an inherited trait
C. a life function
D. a learned behavior

Answer: D

Question: A boy and his sister both play piano. Playing piano is an example of
Answer:


Question: Fungi recycle leaves in forests. Fungi release chemicals onto the leaves to break them down into smaller particles. The fungi use the small particles for growth. Which process allows fungi to obtain the nutrients they need from dead leaves?

Choices:
A. circulation
B. digestion
C. reproduction
D. respiration

Answer: B

Question: Fungi recycle leaves in forests. Fungi release chemicals onto the leaves to break them down into smaller particles. The fungi use the small particles for growth. Which process allows fungi to obtain the nutrients they need from dead leaves?
Answer:


Question: An ice cube is put into a heated pan. What will most likely happen to the molecules in the ice as the ice is heated?

Choices:
A. The molecules will begin to move slower.
B. The molecules will begin to move faster.
C. The molecules will begin to increase in density.
D. The molecules will begin to condense in the air.

Answer: B

The molecules will begin to move faster.

Question: An ice cube is put into a heated pan. What will most likely happen to the molecules in the ice as the ice is heated?
Answer:


Question: Which is the Sun most likely to become toward the end of its lifetime?

Choices:
A. a protostar
B. a black hole
C. a neutron star
D. a white dwarf star

Answer: D

Question: Which is the Sun most likely to become toward the end of its lifetime?
Answer:


Question: Which process is responsible for the growth and repair of human tissue?

Choices:
1. evolution
2. germination
3. cell division
4. natural selection

Answer: 3

Question: Which process is responsible for the growth and repair of human tissue?
Answer:


Question: What force causes objects to be pulled toward Earth?

Choices:
A. friction
B. gravity
C. light
D. electricity

Answer: B

Question: What force causes objects to be pulled toward Earth?
Answer:


Question: Tides occur in the oceans at regular times every day because of

Choices:
A. upper atmospheric disturbances.
B. the tilt of Earth's rotational axis.
C. density differences caused by temperature changes.
D. the gravitational pull of the Sun and the Moon.

Answer: D

the gravitational pull of the Sun and the Moon.

Question: Tides occur in the oceans at regular times every day because of
Answer:


Question: Which process causes water to move from the ocean to the atmosphere during the formation of a hurricane?

Choices:
A. condensation
B. evaporation
C. precipitation
D. runoff

Answer: B

Question: Which process causes water to move from the ocean to the atmosphere during the formation of a hurricane?
Answer:


Question: If the results of an experiment do not support the hypothesis, the scientist will most likely do all of the following except

Choices:
A. check for errors in the experimental procedure.
B. repeat the experiment.
C. change data to support the hypothesis.
D. ask new questions.

Answer: C

Question: If the results of an experiment do not support the hypothesis, the scientist will most likely do all of the following except
Answer:


Question: Astronomers have found low-energy background radiation in every part of the sky that they have studied. This radiation is taken as evidence of energy remaining from which event?

Choices:
A. supernovas
B. the big bang
C. collisions of galaxies
D. modern decay of unstable atoms

Answer: B

Question: Astronomers have found low-energy background radiation in every part of the sky that they have studied. This radiation is taken as evidence of energy remaining from which event?
Answer:


Question: A marsh in your neighborhood dried up during a long, hot summer. This is most likely to cause which of the following changes in the neighborhood?

Choices:
A. an increase in the number of bats
B. a decrease in the number of mosquitoes
C. an increase in the number of insect-eating birds
D. a decrease in the number of Japanese beetles

Answer: B

Question: A marsh in your neighborhood dried up during a long, hot summer. This is most likely to cause which of the following changes in the neighborhood?
Answer:


Question: Which organism is able to work together with other cells of its species?

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

Answer: D

Question: Which organism is able to work together with other cells of its species?
Answer:


Question: India was once its own continent. According to the theory of continental drift, India has collided with and become part of the continent of Asia. This caused

Choices:
A. glaciers in the area to melt.
B. large mountain ranges to form.
C. deep mid-ocean trenches to develop.
D. deserts in the area to become fertile.

Answer: B

Question: India was once its own continent. According to the theory of continental drift, India has collided with and become part of the continent of Asia. This caused
Answer:


Question: Which of these best describes the Moon?

Choices:
A. Older than Earth
B. Smaller than Earth
C. Having the same climate as Earth
D. Having the same atmosphere as Earth

Answer: B

Question: Which of these best describes the Moon?
Answer:


Question: Why do we see different stars in the sky at different times of the year?

Choices:
A. The stars are revolving around the Sun.
B. The Moon is revolving around Earth.
C. Earth is revolving around the Sun.
D. The stars are revolving around Earth.

Answer: C

Question: Why do we see different stars in the sky at different times of the year?
Answer:


Question: Many natural resources are found in Maryland and the surrounding area. Some of these natural resources are renewable and some are nonrenewable. People use both kinds of resources in daily activities. Using natural resources often produces waste products. Which of these natural resources found in Maryland is nonrenewable?

Choices:
A. coal
B. soil
C. water
D. wood

Answer: A

Question: Many natural resources are found in Maryland and the surrounding area. Some of these natural resources are renewable and some are nonrenewable. People use both kinds of resources in daily activities. Using natural resources often produces waste products. Which of these natural resources found in Maryland is nonrenewable?
Answer:


Question: What type of force keeps the planets orbiting the Sun?

Choices:
A. gravitational
B. magnetic
C. electrical
D. nuclear

Answer: A

Question: What type of force keeps the planets orbiting the Sun?
Answer:


Question: A student sorted mineral samples into two groups: dull and shiny. Which of the following properties did the student use to sort the mineral samples into groups?

Choices:
A. cleavage
B. color
C. luster
D. streak

Answer: C

Question: A student sorted mineral samples into two groups: dull and shiny. Which of the following properties did the student use to sort the mineral samples into groups?
Answer:


Question: The motion of atoms and molecules in a substance is

Choices:
A. thermal energy.
B. chemical energy.
C. mechanical energy.
D. electromagnetic energy.

Answer: A

Question: The motion of atoms and molecules in a substance is
Answer:


Question: Euglena is a single-celled photosynthetic organism. Clover is a multicellular green plant. Which of the following activities is carried out by both euglena and clover?

Choices:
A. using light energy to produce sugar
B. producing sex cells for reproduction
C. moving nutrients to specialized tissues
D. transmitting impulses along nerve pathways

Answer: A

Question: Euglena is a single-celled photosynthetic organism. Clover is a multicellular green plant. Which of the following activities is carried out by both euglena and clover?
Answer:


Question: What is a benefit of using technology, such as robotics, in manufacturing?

Choices:
A. decreased production cost
B. decreased productivity
C. increased number of manual-labor jobs
D. increased number of design flaws

Answer: A

Question: What is a benefit of using technology, such as robotics, in manufacturing?
Answer:


Question: Which is the best example of something that has kinetic energy?

Choices:
A. a rock sitting at the top of a steep hill
B. a tennis ball rolling across the court
C. a picture hanging on the wall
D. a piece of wood before it is burned

Answer: B

Question: Which is the best example of something that has kinetic energy?
Answer:


Question: Which type of tissue functions to move the bones?

Choices:
A. skin
B. blood
C. muscle
D. brain

Answer: C

Question: Which type of tissue functions to move the bones?
Answer:


Question: Grasses, shrubs, and trees are called producers because they make

Choices:
1. water
2. carbon dioxide
3. minerals
4. food

Answer: 4

Question: Grasses, shrubs, and trees are called producers because they make
Answer:


Question: Which trait can children inherit from their parents?

Choices:
A. long hair
B. favorite color
C. brown eyes
D. broken arm

Answer: C

Question: Which trait can children inherit from their parents?
Answer:


Question: Which cell function is most directly dependent on the cytoskeleton?

Choices:
A. transport of material inside the cell
B. response of the cell to external pathogens
C. storage of energy in stable long-term forms
D. direction of cellular activity

Answer: A

Question: Which cell function is most directly dependent on the cytoskeleton?
Answer:


Question: On a class field trip, Zach took a walk through the woods using his senses. Zach made observations on the different sights, smells, and sounds in the woods. What system transferred the observations from his senses to his brain?

Choices:
A. nervous system
B. digestive system
C. circulatory system
D. respiratory system

Answer: A

Question: On a class field trip, Zach took a walk through the woods using his senses. Zach made observations on the different sights, smells, and sounds in the woods. What system transferred the observations from his senses to his brain?
Answer:


Question: Which of the following is the best example of a wave?

Choices:
A. a stone rolling downhill
B. a vehicle traveling on a bumpy road
C. a string vibrating on a guitar
D. a grasshopper jumping up and down occasionally

Answer: C

Question: Which of the following is the best example of a wave?
Answer:


Question: The function of a plant's roots is to take in

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

Answer: C

Question: The function of a plant's roots is to take in
Answer:


Question: A magnet can generate an electric current in a wire if the magnet is close enough to the wire and if the magnet is also

Choices:
A. strong.
B. weak.
C. at rest.
D. in motion.

Answer: D

Question: A magnet can generate an electric current in a wire if the magnet is close enough to the wire and if the magnet is also
Answer:


Question: Scientists study fossils to learn about extinct plants and animals. Which of these is the best example of a fossil?

Choices:
A. a footprint in a rock
B. a seashell under water
C. a leaf in a mudpuddle
D. a bone on top of a sand pile

Answer: A

Question: Scientists study fossils to learn about extinct plants and animals. Which of these is the best example of a fossil?
Answer:


Question: A group of citizens want to have a statue built out of marble. They want to place it in a climate that has a slow rate of chemical weathering. In which type of climate would it be best to place the statue for the slowest rate of chemical weathering?

Choices:
A. hot and dry
B. cold and dry
C. hot and humid
D. cold and humid

Answer: B

Question: A group of citizens want to have a statue built out of marble. They want to place it in a climate that has a slow rate of chemical weathering. In which type of climate would it be best to place the statue for the slowest rate of chemical weathering?
Answer:


Question: Which unit of measurement should be used to describe the  mass of an apple?

Choices:
A. gram
B. liter
C. minute
D. meter

Answer: A

Question: Which unit of measurement should be used to describe the  mass of an apple?
Answer:


Question: Which natural event would take the longest time to happen?

Choices:
A. a cloud forming
B. a mountain forming
C. a pond evaporating
D. a river flooding its banks

Answer: D

Question: Which natural event would take the longest time to happen?
Answer:


Question: During a laboratory investigation, a student cracks a clean, empty Erlenmeyer flask. It does not break, but it can no longer be used. Where should the flask be placed?

Choices:
A. trash can
B. biohazard bag
C. broken glass bin
D. hazardous waste bin

Answer: C

Question: During a laboratory investigation, a student cracks a clean, empty Erlenmeyer flask. It does not break, but it can no longer be used. Where should the flask be placed?
Answer: