Consider the given two statements:
Assertion (A):  The earthworm has been referred to as a farmer’s ‘friend’
Reason (R):  They help in the breakdown of complex organic matter as well as in loosening of the soil.
 
1. Both (A) and (R) are True and (R) correctly explains (A).
2. (A) is True but (R) is False
3. (A) is False but (R) is True         
4. Both (A) and (R) are True but (R) does not correctly explain (A).
Subtopic:  Decomposition |
 95%
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Detritus:
I: is dead plant remains such as leaves, bark, flowers and dead remains of animals, including fecal matter.
II: is the raw material for decomposition.
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
Subtopic:  Decomposition |
 97%
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The correctly matched pairs regarding decomposition include:
I: Fragmentation Detritivores break down detritus into smaller particles.
II: Leaching Water-soluble inorganic nutrients go down into the soil horizon and get precipitated as unavailable salts.
III: Catabolism Bacterial and fungal enzymes degrade detritus into simpler inorganic substances.

1. Only I and II
2. Only I and III
3. Only II and III
4. I, II and III
Subtopic:  Decomposition |
 90%
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Consider the two statements:
Assertion (A): Detritivores play an important role as recyclers in the ecosystem's energy flow and biogeochemical cycles.
Reason (R): Detritivores, alongside decomposers, reintroduce vital elements such as carbon, nitrogen, back into the soil, allowing plants to take in these elements and use them for growth.
 
1. Both (A) and (R) are True and (R) correctly explains (A).
2. Both (A) and (R) are True but (R) does not correctly explain (A).
3. (A) is True but (R) is False.
4. Both (A) and (R) are False.
Subtopic:  Decomposition |
 93%
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If decomposers go extinct on Earth:

1.  Detritivores will replace them
2.  Primary production will increase
3.  Nutrients will accumulate in dead plants and animals
4.  There will be no effect on carnivores

Subtopic:  Decomposition |
 82%
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Humus:
1. is formed by humification of detritus as the first step of decomposition in an ecosystem.
2. is highly prone to rapid microbial action.
3. serves as a reservoir of nutrients. 
4. is never degraded further in an ecosystem.
Subtopic:  Decomposition |
 85%
From NCERT
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During the decomposition of complex organic matter:

I:  Fragmentation of detritus creates smaller particles.
II:  Due to leaching water-soluble inorganic nutrients get precipitated.
III:  Catabolism by fungal and bacterial enzymes degrades detritus to simple organic monomers.
IV:  Humus is highly resistant to microbial action
V:  Mineralization is a rapid process of release of inorganic nutrients from the humus

1. All except III are correct
2. All except III and IV are correct
3. All except III and V are correct
4. Only III is correct

Subtopic:  Decomposition |
 60%
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Consider the given two statements:

I:  Humus has the ability to store nutrients.
II:  Humus is a colloidal substance and increases the cation-exchange capacity of the soil.

1. Both I and II are correct and II explains I.
2. Both I and II are correct but II does not explain I.
3. I is correct but II is incorrect.
4. I is incorrect but II is correct.

Subtopic:  Decomposition |
 50%
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Consider the given two statements:
Statement I:  Humus is highly resistant to microbial action and undergoes decomposition at an extremely slow rate.
Statement II: Being colloidal in nature, humus serves as a reservoir of nutrients
    
1. Statement I is correct; Statement II is incorrect
2. Statement I is correct; Statement II is correct         
3. Statement I is incorrect; Statement II is correct
4. Statement I is incorrect; Statement II is incorrect
Subtopic:  Decomposition |
 94%
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The process of mineralization by micro-organisms helps in the release of:

1. Inorganic nutrients from humus
2. Both organic and inorganic nutrients from detritus
3. Organic nutrients from humus
4. Inorganic nutrients from detritus and formation of humus
Subtopic:  Decomposition |
 59%
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