Identify the correct sequence of stages in the process of decomposition.
(A) Humification
(B) Fragmentation
(C) Catabolism
(D) Mineralisation
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → (B), (C), (A), (D)
(B) Fragmentation — first. Detritivores such as the earthworm break the detritus into smaller particles. This gives the microbes a larger surface to act on.
(C) Catabolism — second. The enzymes of bacteria and fungi break the detritus down into simpler inorganic substances. (Leaching, which is not in the list, also happens at this stage: water-soluble nutrients sink into the soil.)
(A) Humification — third. A dark, amorphous substance called humus builds up. It resists microbial action and decomposes very slowly, so it serves as a store of nutrients.
(D) Mineralisation — last. Some microbes slowly break down the humus and release inorganic nutrients into the soil.
NCERT Extract:
Decomposition –
