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Q. No.
Regarding energy flow in an ecosystem:
1. About 2 to 10 % of incident solar radiation is PAR
2. An ecosystem is exempt from the Second Law of Thermodynamics
3. The amount of energy increases at successive trophic levels
4. The number of trophic levels in a grazing food chain is limited
Subtopic:  Energy Flow |
 56%
Level 3: 35%-60%
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After the primary producer level in an ecosystem:
 
1. less and less amount of new chemical energy is added at successive trophic levels
2. no new chemical energy is added at successive trophic levels
3. more and more amount of new chemical energy is added at successive trophic levels
4. less amount of new chemical energy is added at primary consumer level and then the amount of new chemical energy added to successive levels becomes more and more
Subtopic:  Energy Flow |
Level 3: 35%-60%
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Which of the following statement about GFC is incorrect?
1. Sun is the source of energy
2. Begins with consumers
3. Major conduit for energy flow in aquatic ecosystems
4. Size of organisms commonly increase at higher trophic levels
Subtopic:  Energy Flow |
 62%
Level 2: 60%+
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Consider the given two statements:
Assertion (A):   In an ecosystem, organisms are linked through food chains and food webs.
Reason (R): No energy that is trapped into an organism remains in it forever.
 
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 |
 56%
Level 3: 35%-60%
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Consider the given two statements:
Assertion (A): Ecosystems require a constant supply of energy to synthesize molecules and maintain their functioning.
Reason (R): Ecosystems are not exempt from the Second Law of Thermodynamics, which states that systems tend toward increasing disorder (entropy).
 
1. Both (A) and (R) are True and (R) explains (A).
2. Both (A) and (R) are True but (R) does not explain (A).
3. (A) is True but (R) is False.
4. (A) is False but (R) is True.
Subtopic:  Energy Flow |
 56%
Level 3: 35%-60%
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Consider the given two statements:
Assertion (A): Heterotrophs generally have high energy conversion efficiencies when compared to those of plants.
Reason (R): At higher trophic levels, the respiratory costs are dramatically reduced.
 
1. (A) is True but (R) is False
2. Both (A) and (R) are True and (R) correctly explains (R)
3. Both (A) and (R) are True and but (R) does not correctly explain (A)
4. Both (A) and (R) are False
Subtopic:  Energy Flow |
 52%
Level 3: 35%-60%
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Why do ecosystems require a constant supply of energy?
1. To support the cycling of matter through biotic and abiotic components.
2. To counteract the tendency toward increasing disorder, in line with the Second Law of Thermodynamics.
3. To ensure continuous reproduction of species within the ecosystem.
4. To stabilize the populations of consumers at each trophic level.
Subtopic:  Energy Flow |
 63%
Level 2: 60%+
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Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): Most ecosystems would vanish if the sun were not, continuously, providing energy to the Earth.
Reason (R): Ecosystems and living organisms defy second law of thermodynamics.
In the light of the above statements, choose the most appropriate answer from the options given below :
1. Both (A) and (R) are True but (R) does not explain (A).
2. (A) is True but (R) is False.
3. (A) is False but (R) is True.
4. Both (A) and (R) are True and (R) explains (A).
Subtopic:  Energy Flow |
 62%
Level 2: 60%+
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