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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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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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A functional unit of nature, where living organisms interact among themselves and also with the surrounding physical environment is called as:
| 1. | Population | 2. | Biological community |
| 3. | Ecosystem | 4. | Biome |
Subtopic: Introduction |
83%
From NCERT
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A herbivore:
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: | consumes plants. |
| II: | is also called as secondary consumer. |
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: Energy Flow |
88%
From NCERT
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There are certain limitations of ecological pyramids which include:
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: | They do not take into account the same species belonging to two or more trophic levels. |
| II: | They do not accommodate a food web. |
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
Subtopic: Ecological Pyramids |
88%
From NCERT
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