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Q. No.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%
From NCERT
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The correctly matched pairs regarding decomposition include:
1. Only I and II
2. Only I and III
3. Only II and III
4. I, II and III
| 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 |
89%
From NCERT
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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 |
84%
From NCERT
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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 |
91%
From NCERT
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Sun is the only source of energy for all ecosystems on earth except for:
1. Mangroves
2. Deserts
3. Deep sea hydrothermal vents
4. Tundra
1. Mangroves
2. Deserts
3. Deep sea hydrothermal vents
4. Tundra
Subtopic: Ecological Flow |
97%
From NCERT
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In a terrestrial ecosystem, major producers are:
1. herbaceous and woody plants.
2. phytoplankton
3. algae
4. mosses
1. herbaceous and woody plants.
2. phytoplankton
3. algae
4. mosses
Subtopic: Energy Flow |
89%
From NCERT
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Regarding 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: | Herbivores are primary consumers. |
| Statement II: | Primary carnivores are secondary consumers. |
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: Energy Flow |
96%
From NCERT
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Identify the incorrect statement:
| 1. | Death of an organism is the beginning of the detritus food chain/web. |
| 2. | In an aquatic ecosystem, the detritus food chain (DFC) is the major conduit for energy flow. |
| 3. | In a terrestrial ecosystem, a much larger fraction of energy flows through the detritus food chain than through the grazing food chain (GFC). |
| 4. | Detritus food chain may be connected with the grazing food chain at some levels. |
Subtopic: Energy Flow |
85%
From NCERT
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Consider the two statements:
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: | The number of trophic levels in the grazing food chain is restricted. |
| II: | The transfer of energy follows 10 per cent law – only 10 per cent of the energy is transferred to each trophic level from the lower trophic level. |
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
Subtopic: Energy Flow |
87%
From NCERT
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Consider the two statements:
| Assertion (A): | The pyramid of biomass may be "inverted" in a pond ecosystem |
| Reason (R): | In a pond ecosystem, the standing crop of phytoplankton, the major producers, at any given point will be lower than the mass of the heterotrophs, such as fish and insects. |
| 1. | Both (A) and (R) are True and the (R) correctly explains (A). |
| 2. | Both (A) and (R) are True but the (R) does not correctly explain (A). |
| 3. | (A) is True but (R) is False. |
| 4. | Both (A) and (R) are False. |
Subtopic: Ecological Flow |
88%
From NCERT
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