Science (086) — CBSE Class 10 board question

Decomposers are micro-organisms (bacteria and fungi) that break down the complex organic matter of dead plants and animals into simple inorganic substances and return them to the soil.

Consequences of their absence:

1. Dead organic matter (leaves, dead animals) would accumulate and not be recycled.
2. Nutrients would not be returned to the soil, making it infertile and disrupting the nutrient cycle.

• The definition must mention that decomposers break down dead organic matter into simple inorganic substances — both parts are needed.
• The two consequences should focus on: (i) accumulation of dead matter and (ii) loss of soil fertility / breakdown of nutrient cycling. These are the standard CBSE-expected points.
• Keep each consequence to one line for a 2-mark answer; no elaboration needed.