Which one of the following processes during decomposition is correctly described ?
1
Leaching – Water soluble inorganic nutrients rise to the top layers of soil.
2
Fragmentation – Carried out by organisms such as earthworm.
3
Humification – Leads to the accumulation of a dark coloured substance humus which undergoes microbial action at a very fast rate.
4
Catabolism – Last step in the decomposition under fully anaerobic condition.