STAT Understanding Food Chains and Webs

What is a food chain?

• A series of organisms each dependent on the next as a source of food

• A network of interconnected food webs

• A group of organisms that produce their own food

• A cycle of water through the environment

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Which of the following best describes producers in an ecosystem?

• Organisms that decompose organic material

• Organisms that consume other organisms for energy

• Organisms that produce their own food through photosynthesis

• Organisms that are at the top of the food chain

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What role do decomposers play in an ecosystem?

• They produce energy from sunlight

• They break down dead organisms and recycle nutrients

• They are the primary source of energy for all organisms

• They are predators at the top of the food chain

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How does energy flow in an ecosystem?

• From decomposers to producers to consumers

• From consumers to producers to decomposers

• From producers to consumers to decomposers

• From decomposers to consumers to producers

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Differentiate between a food chain and a food web.

• A food chain is a single pathway of energy flow, while a food web is a complex network of interconnected food chains.

• A food chain includes only producers, while a food web includes only consumers.

• A food chain is a network of food webs, while a food web is a single pathway of energy flow.

• A food chain and a food web are the same.

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Why are producers important in a food chain?

• They decompose organic material

• They provide energy for all other organisms in the ecosystem

• They are the top predators

• They recycle nutrients back into the soil

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Explain the importance of decomposers in nutrient cycling.

• They produce energy for the ecosystem

• They prevent the accumulation of dead organic matter

• They are the primary consumers in the food chain

• They are responsible for photosynthesis

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

• Energy flows from decomposers to producers

• Energy is recycled within the ecosystem

• Energy flows in one direction from producers to consumers

• Energy flows from consumers to producers

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Identify the primary source of energy for producers in an ecosystem.

• Decomposed organic matter

• Sunlight

• Chemical energy from other organisms

• Heat from the Earth's core

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How do food chains and food webs contribute to the stability of an ecosystem?

• They limit the number of species in an ecosystem

• They ensure a constant flow of energy and nutrients

• They prevent the extinction of top predators

• They increase competition among species

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