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Q. No.Consider the given two statements:
1. Statement I is correct; Statement II is correct
2. Statement I is incorrect; Statement II is correct
3. Statement I is correct; Statement II is incorrect
4. Statement I is incorrect; Statement II is incorrect
| Statement I: | In a particular climatic condition, decomposition rate is quicker if detritus is rich in lignin and chitin, and slower, if detritus is rich in nitrogen and water-soluble substances like sugars. |
| Statement II: | Warm and moist environment favour decomposition whereas low temperature and anaerobiosis inhibit decomposition. |
2. Statement I is incorrect; Statement II is correct
3. Statement I is correct; Statement II is incorrect
4. Statement I is incorrect; Statement II is incorrect
Subtopic: Decomposition |
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Level 1: 80%+
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Consider the given two statements:
| Assertion (A): | Earthworm is considered as enemy of farmers. |
| Reason (R): | They loosen off the soil. |
| 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, (R) is False |
| 4. | (A) is False, (R) is True |
Subtopic: Decomposition |
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Level 1: 80%+
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In an ecosystem, during decomposition, bacterial and fungal enzymes degrade detritus into simpler inorganic substances. This process is called as:
| 1. | Fragmentation | 2. | Leaching |
| 3. | Catabolism | 4. | Humification |
Subtopic: Decomposition |
71%
Level 2: 60%+
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Decomposers in an ecosystem are:
1. Only I and II is correct
2. Only I and III are correct
3. Only II and III are correct
4. I, II and III are correct
| I: | Carnivores |
| II: | Bacteria |
| III: | Fungi |
1. Only I and II is correct
2. Only I and III are correct
3. Only II and III are correct
4. I, II and III are correct
Subtopic: Decomposition |
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Level 1: 80%+
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By process of leaching during decomposition of detritus, water soluble :
| 1. | organic nutrients go down the soil horizon and get precipitated as unavailable salts |
| 2. | inorganic nutrients go down the soil horizon and get precipitated as unavailable salts |
| 3. | organic nutrients go down the soil horizon and get precipitated as available salts |
| 4. | inorganic nutrients go down the soil horizon and get precipitated as available salts |
Subtopic: Decomposition |
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Level 2: 60%+
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Which process in the ecosystem is primarily responsible for the cycling of nutrients but not energy?
1. Primary production
2. Decomposition
3. Respiration
4. Photosynthesis
1. Primary production
2. Decomposition
3. Respiration
4. Photosynthesis
Subtopic: Decomposition |
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Level 1: 80%+
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The process of decomposition is expected to occur at the fastest rate in:
1. Tropical rain forest
2. Siberia
3. Dry arid conditions
4. Alpine region
1. Tropical rain forest
2. Siberia
3. Dry arid conditions
4. Alpine region
Subtopic: Decomposition |
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Which of the following features characterizes humus?
1. Easily broken down by microbes
2. Rapid decomposition
3. Acts as a reservoir of nutrients
4. Forms very rapidly
1. Easily broken down by microbes
2. Rapid decomposition
3. Acts as a reservoir of nutrients
4. Forms very rapidly
Subtopic: Decomposition |
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The three steps of decomposition occur:
1. sequentially, with catabolism being the last step.
2. sequentially, with leaching being the last step.
3. simultaneously.
4. sequentially, but not in a particular order.
Subtopic: Decomposition |
71%
Level 2: 60%+
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Q. No.
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