Matter and Energy in Food Webs

Dylan drew a diagram showing that certain organisms eat other organisms. The diagram included a caption stating that the amount of available energy decreases with each organism that is eaten. How is this explained by the law of conservation of energy?

• Living things change energy into matter.

• Some of the energy is used for life processes.

• Some energy disappears when living things are eaten.

• Only small amounts of energy can be destroyed at a time.

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Where do animals get their energy?

• by eating plants

• by eating other animals

• from the sun

• from nutrients in the ground

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Worms break down dead plants in the soil to release nutrients. Which property of nutrients shows that they are matter?

• Nutrients are warm.

• Nutrients have mass.

• Nutrients can do work.

• Nutrients contain energy.

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The arrows in a food web show the direction

• water is flowing

• matter and energy are flowing

• organisms are moving in

• consumers are moving in

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What do cells use nitrogen for?

• photosynthesis

• cellular respiration

• to build life molecules

• to break chemical bonds

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What happens to carbon dioxide levels in the atmosphere when we burn fossil fuels?

• carbon dioxide levels in the atmosphere rise
• carbon dioxide levels in the atmosphere fall
• carbon dioxide levels in the atmosphere stay the same

Where do crickets get their energy?

• Cattails
• Marsh Grass
• Grasshoppers
• Shrews

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What is the fruit fly's highest trophic level?

• Primary

• Secondary

• Tertiary

• Quaternary

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Where does photosynthesis take place in cells?

• Mitochondria

• Chlorplasts

• Mesophyll

• Cytoplasm

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What organisms are at the bottom of an energy pyramid?

• Producer
• Consumer
• Decomposer
• Scavenger

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