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Q. No.A community of organisms and their physical environment interacting together form a/an:
1. Population
2. Ecosystem
3. Biome
4. Biosphere
1. Population
2. Ecosystem
3. Biome
4. Biosphere
Subtopic: ECOSYSTEM – STRUCTURE AND FUNCTION |
84%
From NCERT
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Physical structure of 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: | is same for all types of ecosystems. |
| II: | is the result of interaction of biotic and abiotic components. |
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
Subtopic: Introduction | ECOSYSTEM – STRUCTURE AND FUNCTION |
66%
From NCERT
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The second vertical strata in an ecosystem is usually occupied by:
1. herbivores
2. trees
3. shrubs
4. grasses
1. herbivores
2. trees
3. shrubs
4. grasses
Subtopic: ECOSYSTEM – STRUCTURE AND FUNCTION |
73%
From NCERT
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The functions of any ecosystem and of the biosphere as a whole include:
1. Only I and II
2. Only I and III
3. Only II and III
4. I, II and III
| 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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