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Q. No.The primary source of energy for most ecosystems on Earth is:
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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Decomposers in an ecosystem are:
1. Only I and II is correct
2. Only I and III are correct
3. Only II and III are correct
4. I, II and III are correct
| I: | Carnivores |
| II: | Bacteria |
| III: | Fungi |
1. Only I and II is correct
2. Only I and III are correct
3. Only II and III are correct
4. I, II and III are correct
Subtopic: Decomposition |
87%
From NCERT
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gm–2yr–1 or (kcal m–2) yr–1 are the units to express:
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: | Primary Production in an ecosystem |
| II: | Primary Productivity in 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
Subtopic: Ecosystem Productivity |
82%
From NCERT
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In an ecosystem, all the following organisms can be producers except:
1. Spirogyra
2. Agaricus
3. Volvox
4. Nostoc
1. Spirogyra
2. Agaricus
3. Volvox
4. Nostoc
Subtopic: Energy Flow |
80%
From NCERT
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Plants and photosynthetic bacteria (autotrophs), fix sun’s radiant energy to make food from simple inorganic materials where plants capture:
1. Less than 1% of PAR
2. 2-10% of PAR
3. 30% of PAR
4. 50% of PAR
1. Less than 1% of PAR
2. 2-10% of PAR
3. 30% of PAR
4. 50% of PAR
Subtopic: Energy Flow |
85%
From NCERT
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Consider the given two statements:
| Assertion (A): | The number of trophic levels in the grazing food chain is restricted. |
| Reason (R): | A grazing food chain (GFC) is a type of food chain where energy is acquired through photosynthesis. |
| 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: Energy Flow |
68%
From NCERT
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Primary productivity in most ecosystems is directly the result of:
| 1. | Photosynthesis | 2. | Respiration |
| 3. | Herbivory | 4. | Carnivory |
Subtopic: Ecosystem Productivity |
93%
From NCERT
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Consider the given two statements:
| Statement I: | Dry weight is a more accurate way to measure biomass. |
| Statement II: | Wet weight can vary based on the species' environmental and physiological conditions. |
| 1. | Statement I is correct; Statement II is correct |
| 2. | Statement I is correct; Statement II is incorrect |
| 3. | Statement I is incorrect; Statement II is correct |
| 4. | Statement I is incorrect; Statement II is incorrect |
Subtopic: Energy Flow |
93%
From NCERT
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Which of the following ecological pyramids is/are never inverted in any ecosystem?
1. Only I and II
2. Only III
3. Only I and III
4. I, II and III
| I: | Pyramid of numbers |
| II: | Pyramid of biomass |
| III: | Pyramid of energy |
2. Only III
3. Only I and III
4. I, II and III
Subtopic: Ecological Pyramids |
87%
From NCERT
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