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Q. No.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 |
96%
From NCERT
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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%
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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