What is the role of decomposers in an ecosystem?

• A. They convert solar energy to chemical energy.
• B. They are primary producers.
• C. They recycle nutrients by breaking down organic matter.
• D. They convert chemical energy to heat.

Answer: (C)

Decomposers act as the recyclers of ecosystems. They break down dead organisms and waste into simpler inorganic nutrients, returning minerals like nitrogen, phosphorus, and carbon to the soil or water so plants can reuse them. This nutrient recycling keeps the ecosystem productive by maintaining the availability of essential elements for growth. They obtain energy by digesting organic material, not by capturing sunlight like producers, and their main job isn’t converting chemical energy into heat—though metabolism does release some heat. The key idea is that decomposers close the loop in matter flow by mineralizing organic matter back into usable nutrients.