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Q. No.In most ecosystems, which of the following pyramids are upright?
I: pyramid of number
II: pyramid of energy
III: pyramid of biomass
1. Only II
2. Only I and III
3. Only I and II
4. I, II and III
Subtopic: Ecological Pyramids |
56%
From NCERT
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Consider the two statements:
| Assertion (A): | Pyramid of energy can be inverted in aquatic ecosystems. |
| Reason (R): | Aquatic life defies second law of thermodynamics. |
| 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 | Ecological Pyramids |
84%
From NCERT
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Ecological pyramids do not take into account:
1. Only I and II
2. Only I and III
3. Only II and III
4. I, II and III
| I: | The apex predators |
| II: | the same species belonging to two or more trophic levels |
| III: | saprophytes |
1. Only I and II
2. Only I and III
3. Only II and III
4. I, II and III
Subtopic: Ecological Pyramids |
79%
From NCERT
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How many of the given statements are true?
1. 1
2. 2
3. 3
4. 4
| I: | The trophic level of an organism is the position it occupies in a food web. |
| II: | The trophic level represents species and not a functional level. |
| III: | A given organism occupies only one trophic level in a food chain. |
| IV: | The trophic level of an organism is the number of steps it is from the start of the chain. |
1. 1
2. 2
3. 3
4. 4
Subtopic: Ecological Pyramids |
53%
From NCERT
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Study the given pyramid and select the correct statements based on the given figure?
| I: | It represents an ideal pyramid of energy in an ecosystem. |
| II: | Primary producers convert only 1% of the energy in the sunlight available to them into NPP. |
| 1. | Only I | 2. | Only II |
| 3. | Both I and II | 4. | Neither I nor II |
Subtopic: Ecological Pyramids |
70%
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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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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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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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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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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