Food Webs Cycling of Matter and Flow of Energy

The overlapping of food chains results in a ________.

• woven chain

• braided chain

• food web

• food nest

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NGSS.MS-LS2-2

NGSS.MS-LS2-3

An example of a decomposer is a _______.

• butterfly

• bear

• plant

• worm

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NGSS.5-LS2-1

Plants are considered _________ because they make their own food.

• consumers

• producers

• makers

• decomposers

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NGSS.MS-LS1-6

NGSS.MS-LS2-3

These organisms break down dead things.

• Consumers

• Producers

• Decomposers

• Rotters

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NGSS.MS-LS2-3

How do decomposers contribute to the energy flow in a food web?

• By eating live plants and animals.

• By converting sunlight into chemical energy.

• By breaking down dead organisms and releasing nutrients back into the ecosystem.

• By hunting and consuming other animals.

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NGSS.MS-LS2-3

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

Which of the following best describes energy flow in a food web?

• Energy flows from decomposers to producers to consumers

• Energy flows in a cycle among all organisms

• Energy flows from producers to consumers to decomposers

• Energy flows directly from the sun to all organisms equally

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NGSS.MS-LS1-6

NGSS.MS-LS2-3

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

How does a decomposer contribute to the energy flow in an ecosystem?

• By consuming live plants and animals

• By producing its own food through photosynthesis

• By breaking down dead organisms and releasing nutrients back into the ecosystem

• By preying on primary consumers

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NGSS.MS-LS2-3

Why is energy transfer in a food chain not 100% efficient?

• Because some energy is always lost as heat.

• Because consumers create energy during digestion.

• Because producers absorb all the energy from the sun.

• Because decomposers use all the energy from dead organisms.