DAT Ecology Practice Exam

How do consumers influence nutrient cycling besides transferring energy?

By storing nutrients in their bodies indefinitely. By removing nutrients permanently from ecosystems. Through excretion and decomposition, returning nutrients to the environment. By converting nutrients into energy with no waste.

Correct Answer:

Through excretion and decomposition, returning nutrients to the environment.

Explanation:

Consuming organisms influence nutrient cycling by returning nutrients to the environment after using them for growth and metabolism. When they excrete waste and eventually die, decomposers break down their organic matter, releasing nutrients like nitrogen and phosphorus back into soil and water in forms plants can take up. This recycling keeps nutrients available for producers and the rest of the food web, closing the loop even as energy moves from producers to consumers to decomposers. If nutrients were stored forever in bodies or removed permanently, or if nutrients were somehow turned into energy with no waste, the cycle would stall. Excretion and decomposition are the key processes that return nutrients to the environment for reuse.

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