Decomposers break down complex organic matter into -

The correct answer is Option (2) → Inorganic substances like \( CO_2, H_2O \) and nutrients

Decomposition is the breakdown of dead organic matter (detritus) by decomposers.

Option (1) Inorganic substances like \( O_2, H_2O \) and \( CO_2 \) — Incorrect. Decomposition uses up oxygen; it does not release it.

Option (2) Inorganic substances like \( CO_2, H_2O \) and nutrients — Correct. All three products are inorganic, and the nutrients go back to the soil for plants to use again.

Option (3) Inorganic substances like \( O_2, H_2S \) and nutrients — Incorrect. Oxygen is consumed, not produced, and H₂S forms only in oxygen-free conditions.

Option (4) Inorganic substances like \( N_2, H_2O \) and \( CO_2 \) — Incorrect. Nitrogen gas is not an end product of decomposition; nitrogen is set free as nutrient ions.

NCERT Extract:
Decomposition – “You may have heard of the earthworm being referred to as the farmer’s ‘friend’. This is so because they help in the breakdown of complex organic matter as well as in loosening of the soil. Similarly, decomposers break down complex organic matter into inorganic substances like carbon dioxide, water and nutrients and the process is called decomposition.”