Unit 8 Test Review

Which of the following best describes the flow of energy in an ecosystem?

• Energy flows in a circular pattern.

• Energy flows in a linear pattern from the sun to producers and then to consumers.

• Energy is recycled back to the sun.

• Energy is stored indefinitely in the ecosystem.

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TEKS.SCI.7.12A

What happens to the amount of available energy as it moves up the trophic levels in an energy pyramid?

• It increases.

• It remains the same.

• It decreases.

• It fluctuates randomly.

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TEKS.SCI.7.12A

Which of the following diagrams correctly represents the flow of energy in a food chain?

• Sun → Producers → Consumers → Decomposers

• Consumers → Producers → Sun → Decomposers

• Decomposers → Consumers → Producers → Sun

• Producers → Sun → Consumers → Decomposers

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TEKS.SCI.7.12A

In an energy pyramid, which level contains the most energy?

• Tertiary consumers

• Secondary consumers

• Primary consumers

• Producers

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TEKS.SCI.7.12A

How does the recycling of matter and nutrients sustain ecosystems?

• It prevents the loss of energy.

• It ensures a continuous supply of energy.

• It allows nutrients to be reused by different organisms.

• It stops the flow of energy.

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TEKS.SCI.7.12B

Which of the following best explains why energy decreases at each successive trophic level?

• Energy is destroyed as it moves up the pyramid.

• Energy is converted into matter.

• Energy is lost as heat due to metabolic processes.

• Energy is absorbed by the sun.

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TEKS.SCI.7.12A

What role do decomposers play in the recycling of nutrients within an ecosystem?

• They produce energy for the ecosystem.

• They break down dead organisms, returning nutrients to the soil.

• They consume producers for energy.

• They store energy for future use.

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TEKS.SCI.7.12B

Which of the following statements is true about the energy flow in an ecosystem?

• Energy is recycled within the ecosystem.

• Energy flows in one direction and is not recycled.

• Energy is created by consumers.

• Energy is stored in the atmosphere.

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TEKS.SCI.7.12A

How does the energy flow in a food web differ from that in a food chain?

• A food web shows multiple pathways of energy flow, while a food chain shows a single pathway.

• A food web shows energy being recycled, while a food chain does not.

• A food web shows energy flowing in a circular pattern, while a food chain shows a linear pattern.

• A food web shows energy being stored, while a food chain shows energy being used.

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TEKS.SCI.7.12A

What is the primary source of energy for most ecosystems?

• The moon

• The sun

• The Earth's core

• The ocean

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TEKS.SCI.7.12A