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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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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If there is 10,000 kJ of energy available in the producer population, how many kilojoules of energy would be found in the carnivore population?

• 10,000 kJ

• 1,000 kJ

• 100 kJ

• 10kJ

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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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How does energy flow in a food web?

• From decomposers to producers to consumers

• From producers to consumers to decomposers

• From consumers to producers to decomposers

• Energy does not flow in a food web

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DOK Level 2: Skill/Concept

Why is it important for an ecosystem to have a variety of different food chains and not just one?

• It ensures more energy is available at each trophic level

• It prevents any single species from becoming too dominant

• It provides multiple pathways for energy flow and increases ecosystem stability

• It makes the ecosystem less complex and easier to study

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DOK Level 3: Strategic Thinking

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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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

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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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