Q. Which of the following is the correct sequence of decomposition?
Catabolism
Fragmentation
Leaching
Humification
Mineralisation
Choose the correct answer using the codes given below: Answer:
2, 3, 1, 4, 5
Notes:
The important steps in the process of decomposition are fragmentation, leaching, catabolism, humification, and mineralisation.
Detritivores (such as earthworms) break down detritus into smaller particles. This process is called fragmentation.
By the process of leaching, water-soluble inorganic nutrients go down into the soil horizon and get precipitated as unavailable salts.
Bacterial and fungal enzymes degrade the detritus into simpler inorganic substances. This process is called catabolism.
Humification leads to the accumulation of a dark-colored amorphous substance called humus, which is highly resistant to microbial action, and undergoes decomposition at an extremely slow rate.
The humus is further degraded by some microbes, and the release of inorganic nutrients occurs through the process known as mineralisation.