Q. No.Consider the following statements regarding energy flow in an ecosystem:
1. Only I is correct.
2. Only II is correct.
3. Both I and II are correct.
4. Neither I nor II is correct.
| I: | Energy flow in an ecosystem is unidirectional. |
| II: | Energy once lost as heat can be recycled within the ecosystem. |
2. Only II is correct.
3. Both I and II are correct.
4. Neither I nor II is correct.
Subtopic: Energy Flow |
69%
Level 2: 60%+
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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%
Level 1: 80%+
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Each trophic level has a certain mass of living material at a particular time, best called as:
| 1. | Biomass | 2. | Standing state |
| 3. | Standing crop | 4. | Gross productivity |
Subtopic: Energy Flow |
83%
Level 1: 80%+
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How many statements regarding detritus food chain are correct?
1. 0
2. 1
3. 2
4. 3
| I: | It begins with dead organic matter. |
| II: | It is the major conduit for energy flow in aquatic ecosystem. |
| III: | It is not connected with the grazing food chain at any level. |
1. 0
2. 1
3. 2
4. 3
Subtopic: Energy Flow |
70%
Level 2: 60%+
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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 |
71%
Level 2: 60%+
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Consider the given two statements:
| Assertion (A): | In a food chain, man is considered as an apex predator and a top consumer. |
| Reason (R): | In a food chain, man is placed at the top and has no known natural predators. |
| 1. | Both (A) and (R) are True and (R) correctly explains (A) |
| 2. | Both (A) and (R) are True and (R) does not correctly explain (A) |
| 3. | (A) is True, (R) is False |
| 4. | (A) is False, (R) is False |
Subtopic: Energy Flow |
68%
Level 2: 60%+
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In a terrestrial ecosystem, major producers are:
| 1. | herbaceous and woody plants. | 2. | phytoplankton |
| 3. | algae | 4. | mosses |
Subtopic: Energy Flow |
87%
Level 1: 80%+
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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 (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 (A). |
Subtopic: Energy Flow |
60%
Level 2: 60%+
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In an ecosystem, all the following organisms can be producers except:
| 1. | Spirogyra | 2. | Agaricus |
| 3. | Volvox | 4. | Nostoc |
Subtopic: Energy Flow |
75%
Level 2: 60%+
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The producers in aquatic ecosystems include all except:
| 1. | cyanobacteria | 2. | algae |
| 3. | plants | 4. | zooplankton |
Subtopic: Energy Flow |
67%
Level 2: 60%+
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