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Q. No.The functions of any ecosystem and of the biosphere as a whole include:
I:
conversion of inorganic into organic material, with the help of the radiant energy of the sun, by the autotrophs
II:
consumption of the autotrophs by heterotrophs;
III:
decomposition and mineralization of the dead matter to release them back for reuse by the autotrophs.
1. Only I and II
2. Only I and III
3. Only II and III
4. I, II and III
Subtopic: ECOSYSTEM – STRUCTURE AND FUNCTION |
83%
From NCERT
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Of the given 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: | A constant input of solar energy is the basic requirement for almost all ecosystems to function and sustain. |
| II: | There is unidirectional movement of energy towards the higher trophic levels and its dissipation as heat to the environment. |
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
Subtopic: Ecosystem Productivity | Energy Flow |
95%
From NCERT
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The amount of biomass or organic matter produced per unit area over a time period by plants during photosynthesis is:
1. Primary production
2. Primary productivity
3. Secondary production
4. Secondary productivity
1. Primary production
2. Primary productivity
3. Secondary production
4. Secondary productivity
Subtopic: Ecosystem Productivity |
From NCERT
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Consider the 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: | Gross primary productivity (GPP) minus respiration losses (R), is the net primary productivity (NPP). |
| Statement II: | GPP is available for consumption by herbivores. |
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: Ecosystem Productivity |
79%
From NCERT
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The annual net primary productivity of the whole biosphere is approximately:
1. 170 billion tons (fresh weight) of organic matter.
2. 170 billion tons (dry weight) of organic matter.
3. 115 billion tons (dry weight) of organic matter.
4. 55 billion tons (fresh weight) of organic matter.
1. 170 billion tons (fresh weight) of organic matter.
2. 170 billion tons (dry weight) of organic matter.
3. 115 billion tons (dry weight) of organic matter.
4. 55 billion tons (fresh weight) of organic matter.
Subtopic: Ecosystem Productivity |
87%
From NCERT
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What is the fate of the vast majority of energy entering into an ecosystem?
1. it gets converted into biomass by plants.
2. it gets utilized by secondary consumers.
3. it is lost as heat.
4. it gets used by the primary consumers.
1. it gets converted into biomass by plants.
2. it gets utilized by secondary consumers.
3. it is lost as heat.
4. it gets used by the primary consumers.
Subtopic: ECOSYSTEM – STRUCTURE AND FUNCTION |
70%
From NCERT
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Detritus:
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: | is dead plant remains such as leaves, bark, flowers and dead remains of animals, including fecal matter. |
| II: | is the raw material for decomposition. |
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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