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Q. No.
Assertion(A): Secondary succession takes a longer time to establish a climax community compared to primary succession.
Reason(R): Soil and sediments are already present in the areas where secondary succession happens.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true, but (R) is not the correct explanation of (A).
3. (A) is true, but (R) is false.
4. (A) is false, but (R) is true.
78%
Level 2: 60%+
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Assertion(A): Primary productivity depends on a variety of environmental factors.
Reason(R): Primary productivity varies in different types of ecosystems.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true, but (R) is not the correct explanation of (A).
3. (A) is true, but (R) is false.
4. (A) is false, but (R) is true.
Reason(R): Primary productivity varies in different types of ecosystems.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true, but (R) is not the correct explanation of (A).
3. (A) is true, but (R) is false.
4. (A) is false, but (R) is true.
Subtopic: Ecosystem Productivity |
57%
Level 3: 35%-60%
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Although all types of ecological pyramids are generally upright, an inverted pyramid of biomass can be found in:
| 1. | Forest ecosystem | 2. | Marine ecosystem |
| 3. | Grassland ecosystem | 4. | Tundra ecosystem |
Subtopic: Ecological Pyramids |
87%
Level 1: 80%+
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The climax community established in ecological succession is best described as:
| 1. | the community of pioneers in ecological succession. |
| 2. | the establishment of only one type of primary producer in the ecosystem. |
| 3. | being in near equilibrium with the environment. |
| 4. | rapidly changing community in its composition of species. |
76%
Level 2: 60%+
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Consider the two statements:
| Statement I: | Nutrients are never lost from the ecosystems, rather they are recycled time and again indefinitely. |
| Statement II: | The amount of nutrients, such as carbon, nitrogen, phosphorus, calcium, etc., present in the soil at any given time, is referred to as the standing crop. |
| 1. | Statement I is correct; Statement II is correct |
| 2. | Statement I is correct; Statement II is incorrect |
| 3. | Statement I is incorrect; Statement II is correct |
| 4. | Statement I is incorrect; Statement II is incorrect |
69%
Level 2: 60%+
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Who, amongst the following, is revered as the father of ecology in India?
1. Gurdev Singh Khush
2. M. S. Swaminathan
3. Ramdeo Misra
4. Salim Ali
1. Gurdev Singh Khush
2. M. S. Swaminathan
3. Ramdeo Misra
4. Salim Ali
Subtopic: Introduction |
82%
Level 1: 80%+
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Which step in the decomposition of detritus is carried out by bacteria and fungi?
| 1. | fragmentation | 2. | leaching |
| 3. | catabolism | 4. | mineralisation |
Subtopic: Decomposition |
69%
Level 2: 60%+
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The consumers that feed on herbivores are correctly described as:
1. Primary producers
2. Primary consumers
3. Secondary carnivores
4. Secondary consumers
1. Primary producers
2. Primary consumers
3. Secondary carnivores
4. Secondary consumers
Subtopic: Energy Flow |
62%
Level 2: 60%+
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Out of the total cost of various ecosystem services, which of the following accounts for maximum per cent?
1. nutrient cycling
2. soil formation
3. climate regulation
4. recreation
1. nutrient cycling
2. soil formation
3. climate regulation
4. recreation
75%
Level 2: 60%+
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The annual net primary productivity of the whole biosphere is approximately 170 billion tons (dry weight) of organic matter. Of this, the productivity of the oceans is:
1. 55 billion tons.
2. 70 billion tons.
3. 100 billion tons.
4. 120 billion tons.
1. 55 billion tons.
2. 70 billion tons.
3. 100 billion tons.
4. 120 billion tons.
Subtopic: Ecosystem Productivity |
89%
Level 1: 80%+
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