Question

What will be the consequence of the absence of decomposers in the ecosystem

Answer 1

Decomposers help in decomposing dead plants and animals, and hence act as cleansing agents of the environment. They also help restore to the soil, air and water the various elements that plants and animals are made of, for reuse by the producers. If there were no decomposers in the ecosystem, then dead plants and animals would remain as such, and their elements would never be returned to the soil, air and water.