Energy Flow in Ecosystems

Question 2 • Science 7 B (M12 25/26 S2)

Which statement explains the most realistic way to model energy flow in an ecosystem?

Answer

A food chain is most realistic because many organisms eat one type of food, and energy moves through a single pathway.

A food chain is most realistic because many organisms eat a variety of foods, and energy moves through different pathways.

A food web is most realistic because many organisms eat one type of food, and energy moves through a single pathway.

A food web is most realistic because many organisms eat a variety of foods, and energy moves through different pathways.

Explanation

A food web is the most realistic model because organisms often eat several kinds of food, and an organism may be eaten by different predators. This creates many connected pathways for energy to move through the ecosystem. A food chain shows only one pathway, so it is less realistic.

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