Which one of the following processes during decomposition i…

Biology Ecosystem Structure and Function, Productivity and Decomposition Single Correct MCQ

Published on: August 13, 2026

Which one of the following processes during decomposition is correctly matched?

( a) Fragmentation - Carried out by organisms such as earthworm

Catabolism - Last step in the decomposition under fully anaerobic condition

Humification - Leads to the accumulation of a dark coloured substance humus which undergoes microbial action at a very fast rate

Leeching - Water soluble inorganic nutrients rise to the top layers of soil

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The correct answer is:

Fragmentation is the breakdown of detritus into smaller particles by detritivores like earthworms. The other options are incorrect because humus decomposes slowly, leaching moves nutrients downward, and catabolism is not the last anaerobic step.

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