Question

Which of the following is not a part of the decomposition process?

• A. Fragmentation and leaching
• B. Catabolism
• C. Humification, mineralization
• D. Sedimentation, aeration

Answer 1

The correct option is D

Sedimentation, aeration

The decomposition cycle includes a series of steps. Detritivores (e.g., earthworm) break down detritus into smaller particles in a process called fragmentation. By the process of leaching, watersoluble inorganic nutrients go down into the soil and get precipitated as unavailable salts. This is followed by catabolism where bacterial and fungal enzymes degrade detritus into simpler inorganic substances. Humification leads to accumulation humus. Being colloidal in nature it serves as a reservoir of nutrients. The humus is further degraded by some microbes and release of inorganic nutrients occur by the process known as mineralisation. Sedimentation is a process by which suspended, particulate matter settles down in a liquid medium, and aeration is the amount of oxygen dissolved or available in the medium. Although the aeration of the soil is an aspect that affects decomposition, sedimentation is not a part of decomposition.