Sample Questions — Decomposition
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MCQ
In what way does humus benefit plant growth despite decomposing slowly?
✅ Correct Answer: D
Being colloidal, humus holds nutrients and gradually releases them into the soil.
MCQ
What makes humus stable and long-lasting in soil?
✅ Correct Answer: D
Humus decomposes extremely slowly because it resists microbial degradation.
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MCQ
Match the decomposition product or condition (Column I) with its description (Column II):
Column I
A. Humus
B. Mineralisation
C. Warm, moist environment
D. Oxygen availability
Column II
1. Releases inorganic nutrients
2. Stable colloidal nutrient reservoir
3. Enhances microbial activity
4. Required for aerobic decomposition
✅ Correct Answer: A
Humus = colloidal, nutrient-rich; Mineralisation = releases inorganic nutrients; Warm, moist = accelerates microbial activity; Oxygen = necessary for aerobic breakdown.
MCQ
Which of the following organisms is an example of a detritivore?
✅ Correct Answer: A
Earthworm is a detritivore, aiding in the fragmentation of detritus.
MCQ
Assertion (A): Cold, anaerobic conditions promote rapid decomposition.
Reason (R): Microbial activity is enhanced at low temperatures. Which option correctly describes A and R?
✅ Correct Answer: D
Decomposition is slowed in cold, anaerobic conditions due to suppressed microbial activity.
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