(i) Decomposers help in decomposing the dead bodies of plants and animals and hence act as cleansing agents of the environment.

(ii) Decomposers also help in putting back the various elements of which dead plants and animals are made, back into the soil, air and water for reuse by the producers like crop plants.

(iii) They help in recycling of the nutrients.

(iv) They decompose dead remains thereby providing space for new life to settle in the biosphere.