Energy Flow in Ecosystems Quiz

What is the primary source of energy for most ecosystems on Earth?

• The Moon

• The Sun

• Wind

• Fossil fuels

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TEKS.SCI.7.12A

Which term describes organisms that make their own food using sunlight?

• Consumers

• Producers

• Decomposers

• Herbivores

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TEKS.SCI.7.12A

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

• Primary consumers

• Producers

• Secondary consumers

• Tertiary consumers

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TEKS.SCI.7.12A

What process do plants use to convert sunlight into chemical energy?

• Respiration

• Photosynthesis

• Digestion

• Fermentation

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TEKS.SCI.7.12A

Which of the following best describes the role of decomposers in an ecosystem?

• They produce energy from sunlight.

• They recycle nutrients by breaking down dead organisms.

• They consume producers.

• They store energy in fat.

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TEKS.SCI.7.12B

What is the main reason energy decreases as it moves up trophic levels in an energy pyramid?

• Energy is created at each level.

• Some energy is lost as heat at each transfer.

• Energy is recycled completely.

• Energy increases at higher levels.

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TEKS.SCI.7.12A

Which of the following is an example of a simple food chain?

• Grass → Rabbit → Fox

• Sun → Water → Soil

• Tree → Rock → Bird

• Fish → Water → Sun

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TEKS.SCI.7.12A

Which process returns nutrients to the soil after organisms die?

• Photosynthesis

• Decomposition

• Respiration

• Transpiration

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TEKS.SCI.7.12B

If a grasshopper eats grass and is then eaten by a frog, which trophic level does the frog represent?

• Producer

• Primary consumer

• Secondary consumer

• Decomposer

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TEKS.SCI.7.12A

Why do energy pyramids typically have fewer organisms at the top than at the bottom?

• Energy increases at higher levels

• Less energy is available at higher trophic levels

• More sunlight reaches the top

• Nutrients are only found at the top

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TEKS.SCI.7.12A