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Q. No.About what percentage of photosynthetically active radiation (PAR) are plants able to capture?
1. 1 to 5%
2. 2 to 10%
3. 40 to 50%
4. 90 to 100%
1. 1 to 5%
2. 2 to 10%
3. 40 to 50%
4. 90 to 100%
Subtopic: Components & Types of Ecosystems |
87%
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Regarding decomposition:
| Statement I: | Anaerobiosis speeds up decomposition. |
| Statement II: | Warm and moist conditions favor decomposition. |
| 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 |
Subtopic: Decomposition |
82%
From NCERT
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A food chain typically represents:
| 1. | The flow of nutrients in an ecosystem. |
| 2. | The cyclic movement of water through different trophic levels. |
| 3. | The sequence of organisms through which energy flows in an ecosystem. |
| 4. | The complex interrelationships of all organisms in an ecosystem. |
Subtopic: Energy Flow |
81%
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Study the given two statements regarding the process of decomposition in an ecosystem:
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
| I: | By the process of leaching, water-soluble inorganic nutrients go down into the soil horizon and get precipitated as unavailable salts. |
| II: | Bacterial and fungal enzymes degrade detritus into simpler inorganic substances. This process is called catabolism. |
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
Subtopic: Decomposition |
88%
From NCERT
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A grazing food chain is different from a detritus food chain because:
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
| I: | GFC is the major conduit of energy flow in terrestrial ecosystem. |
| II: | GFC begins with dead organic matter. |
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
Subtopic: Energy Flow |
63%
From NCERT
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Which component is directly related to ecosystem productivity?
| 1. | Rate of plant respiration |
| 2. | Amount of available light energy converted to chemical energy by photosynthesis |
| 3. | Total biomass present in the ecosystem |
| 4. | Number of consumers in the ecosystem |
Subtopic: Ecosystem Productivity |
65%
From NCERT
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Which statement correctly describes the processes of decomposition?
| 1. | Decomposition does not occur in waterlogged and frozen areas. |
| 2. | Decomposition requires oxygen, water, and suitable temperatures. |
| 3. | Nutrient cycling is hindered by rapid decomposition. |
| 4. | Decomposers are typically large vertebrate animals. |
Subtopic: Decomposition |
85%
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Consider the given two statements:
| Assertion (A): | An inverted pyramid of biomass in aquatic ecosystems is not a paradox. |
| Reason (R): | Pyramid of biomass is always inverted in all 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: Ecological Pyramids |
85%
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The organisms that are not a part of the second trophic level in an ecosystem will be:
| 1. | Zooplankton | 2. | Grasshopper |
| 3. | Phytoplankton | 4. | Cow |
Subtopic: Energy Flow |
84%
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What does the 10 percent rule in an ecosystem refer to?
| 1. | 10 percent of the organisms in any ecosystem are predators. |
| 2. | Only 10 percent of an ecosystem's plants are eaten by herbivores. |
| 3. | Approximately 10 percent of energy is transferred from one trophic level to the next higher level. |
| 4. | 10 percent of the water in an ecosystem is used by plants for photosynthesis |
Subtopic: Energy Flow |
97%
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