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

Question

Catabolism – Last step in the decomposition under fully anaerobic condition

Leaching – Water soluble inorganic nutrients rise to the top layers of soil

Fragmentation –Carried out by organisms such as earthworm

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

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