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Q. No.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
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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Consider the given two statements:
| Assertion (A): | Earthworm is considered as enemy of farmers. |
| Reason (R): | They loosen off the soil. |
| 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, (R) is False |
| 4. | (A) is False, (R) is True |
Subtopic: Decomposition |
94%
From NCERT
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The primary source of energy for most ecosystems on Earth is:
1. Wind
2. Sunlight
3. Geothermal energy
4. Redox reactions
1. Wind
2. Sunlight
3. Geothermal energy
4. Redox reactions
Subtopic: Energy Flow |
98%
From NCERT
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| Assertion (A): | Ecosystems are exempt from the second law of thermodynamics. |
| Reason (R): | Ecosystems do not require a constant supply of energy. |
| 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, (R) is False |
| 4. | (A) is False, (R) is False |
Subtopic: Energy Flow |
72%
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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