Which term describes producers?

• A. Heterotrophs
• B. Autotrophs
• C. Decomposers
• D. Carnivores

Answer: (B)

Producers are the organisms at the base of a food web that make their own food using energy from the sun or from inorganic chemical energy. The term for these producers is autotrophs. Autotrophs use processes like photosynthesis (in plants, algae, and some bacteria) to convert light, carbon dioxide, and water into glucose and other organic molecules, which provide energy for themselves and for organisms higher up in the chain. This is what sets them apart from others that must obtain energy by consuming or breaking down materials from the environment.

Heterotrophs are the organisms that rely on eating other organisms for energy. Decomposers break down dead matter and recycle nutrients, but they are still consumers. Carnivores are animals that eat other animals and are also consumers. So autotrophs are the producers because they synthesize energy-rich molecules themselves, forming the energy source for the rest of the ecosystem.