Q. Which one of the following processes during decomposition is correctly described?
A) Fragmentation – Carried out by organisms such as earthworm
B) Humification – Leads to the accumulation of a dark coloured substance humus which undergoes microbial action at a very fast rate
C) Catabolism – Last step in the decomposition under fully anaerobic condition
D) Leaching – Water soluble inorganic nutrients rise to the top layers of soil
Explanation
[Solution from source] Fragmentation, the breaking of detritus into small particles, is carried out by detritivores such as earthworms. Humus decomposes extremely slowly, leaching carries soluble nutrients down into lower soil layers, and catabolism is enzymatic breakdown, not the last anaerobic step. Answer (1).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.