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Q. No.About what per cent of the energy in the sunlight, available to them, primary producers can convert into Net Primary Productivity (NPP)?
1. 1
2. 10
3. 50
4. 90
Subtopic: Ecological Pyramids |
56%
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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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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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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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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Consider the given two statements:
| Assertion (A): | Organisms at each trophic level depend on those at the lower trophic level for their energy demands. |
| Reason (R): | The amount of energy decreases at successive trophic levels. |
| 1. | Both (A) and (R) are true and (R) correctly explains the (A). |
| 2. | (A) is true but (R) is false |
| 3. | (A) is false but (R) is true |
| 4. | Both (A) and (R) are true but (R) does not correctly explain the (A). |
Subtopic: Energy Flow |
61%
From NCERT
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