Freshwater Ecology Practice Test

Which term describes producers that convert light energy into chemical energy?

Omnivores Detritivores Primary Producers Decomposers

Correct Answer:

Primary Producers

Explanation:

The concept here is who can capture light energy and turn it into stored chemical energy. Organisms that perform photosynthesis—plants, algae, and some bacteria—are autotrophs that serve as the base of the ecosystem’s energy flow. They convert light energy into chemical energy by building sugars and other organic molecules, which then fuel all other organisms higher up the food web. The term for these energy-transforming producers is primary producers. Other groups mentioned—omnivores, detritivores, and decomposers—are consumers or recyclers that rely on organic matter produced by the primary producers rather than capturing light energy themselves. Detritivores eat detritus, decomposers break down dead material, and none of them directly convert light into chemical energy.

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