Unit 8 Review

The moon remains in orbit around Earth because of the force of —

• A. Earth's rotation

• B. the moon's rotation

• C. Earth's gravity

• D. the sun's gravity

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An object will continue moving in a straight line unless it is acted on by an unbalanced force. Which of the following best explains Earth’s motion?

• There is no unbalanced force acting on Earth because space is empty and nothing touches Earth.

• The gravitational force pulling Earth toward the sun is equal and opposite to the force pulling the sun toward Earth, so there is no unbalanced force acting on Earth.

• The sun moves in an elliptical orbit around Earth, and the sun’s gravity pulls Earth along.

• Earth moves in an elliptical orbit around the sun because the gravitational force of the sun attracts Earth.

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"Made mostly of ice", fits best under which heading in the Venn diagram below?

• A. Asteroid

• B. Meteor

• C. Comet

• D. Section X

Which of the following NASA programs resulted in the first humans walking on the moon?

• Gemini

• Mercury

• Skylab

• Apollo

What do the arrows represent on a food chain or food web?

• The order of size of organisms in the ecosystem

• The direction of energy flow through organisms

• The energy increases as you move from left to right

• The importance of organisms in the chain

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Which of the following statements best describes the flow of energy in the energy pyramid?

• There is no energy above the level of producers in the system.

• Each group receives only a small amount of the energy from the level below it

• There is less energy in a producer level than a consumer level.

• As you go higher in the pyramid, the amount of energy increases.

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How will a large decrease in the number of rats impact the food web?

• There will be a decrease in the number of cacti and sagebrush plants.

• There will be a decrease in the number of snakes, coyotes, and hawks.

• There will be an increase in the number of ants, tarantulas, and snakes.

• There will be an increase in the number of snakes, coyotes, and hawks.

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What would be the result if the population of wild cats increased in this forest ecosystem?

• the population of rabbits and mice will decrease

• the population of goats and rabbits will increase

• the population of owls and snakes will increase

• The population of lions and jackals will decrease

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Which of the following is the best explanation for how the element carbon first enters the food chain?

• Decomposers break down organic matter, releasing carbon into the soil

• Herbivores eat carbon containing plants

• Consumers undergo respiration which sends carbon into the atmosphere

• Producers absorb carbon from the atmosphere to use as an ingredient for photosynthesis

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As a plant goes through the process of photosynthesis-

• radiant energy is converted into chemical energy

• radiant energy is changed into potential energy

• thermal energy is exchanged for kinetic energy

• heat energy is transferred into potential energy

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