CBSE Class 10 Science 2018 · Paper 31(B) · Question 5

Decomposers are micro-organisms, mainly bacteria and fungi, that break down the complex organic substances of dead plants and animals and their wastes into simple inorganic substances. Role (any two): 1. They act as natural cleansing agents, clearing away dead remains and wastes. 2. They return the nutrients to the soil, where plants can absorb them again. 3. They help to recycle matter between the biotic and abiotic components of the environment. Other correct points also earn credit.