Q. No.Energy flow and nutrient cycling are two important components of an ecosystem. What will be true comparison of the two?
| 1. | The amount of energy is much greater than the amount of nutrients |
| 2. | Organisms always need nutrients, but they don't always need energy |
| 3. | Nutrients are recycled, but energy is not |
| 4. | Organisms always need energy, but they don't always need nutrients |
Subtopic: Energy Flow | Nutrient Cycling |
73%
Level 2: 60%+
Hints
Study the given diagram and select the correct statements:
1. Only Statement I is correct.
2. Only Statement II is correct.
3. Both Statement I and Statement II are correct.
4. Both Statement I and Statement II are incorrect.
| Statement I: | There is unidirectional movement of energy towards the higher trophic levels and its dissipation and loss as heat to the environment. |
| Statement II: | Nutrients are never lost from the ecosystems, rather they are recycled time and again indefinitely. |
2. Only Statement II is correct.
3. Both Statement I and Statement II are correct.
4. Both Statement I and Statement II are incorrect.
Subtopic: Energy Flow |
90%
Level 1: 80%+
Hints
Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
In the light of the above statements, choose the most appropriate answer from the options given below :
| 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. |
| 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%+
Hints
Consider the two statements:
1. Only Statement I is correct.
2. Only Statement II is correct.
3. Both Statement I and Statement II are correct.
4. Both Statement I and Statement II are incorrect.
| Statement I: | No energy that is trapped into an organism remains in it forever. |
| Statement II: | All animals depend on plants [directly or indirectly] for their food requirements. |
2. Only Statement II is correct.
3. Both Statement I and Statement II are correct.
4. Both Statement I and Statement II are incorrect.
Subtopic: Energy Flow |
92%
Level 1: 80%+
Hints
Primary carnivores are, most aptly, characterized as:
| 1. | Secondary producers | 2. | Primary consumers |
| 3. | Secondary consumers | 4. | Tertiary consumers |
Subtopic: Energy Flow |
79%
Level 2: 60%+
Hints
The detritus food chain:
| I: | begins with dead organic matter |
| II: | is the major conduit of energy flow in aquatic 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: Energy Flow |
74%
Level 2: 60%+
Hints
In a terrestrial ecosystem, a much larger fraction of energy flows through the:
| 1. | DFC | 2. | GFC |
| 3. | Either of DFC or GFC | 4. | Nither of DFC nor GFC |
Subtopic: Energy Flow |
78%
Level 2: 60%+
Hints
Consider the following statements:
| I: | In an aquatic ecosystem, Grazing Food Chain (GFC) is the major conduit for energy flow. |
| II: | In a terrestrial ecosystem, Detritus Food Chain (DFC) is the major conduit for energy flow. |
| III: | GFC and DFC are not interconnected at any level. |
Which of the above statements are true?
| 1. | I and II only | 2. | I and III only |
| 3. | II and III only | 4. | I, II, and III |
Subtopic: Energy Flow |
85%
Level 1: 80%+
Hints
In an aquatic food chain, zooplankton occupy which trophic level?
| 1. | First | 2. | Second |
| 3. | Third | 4. | Fourth |
Subtopic: Energy Flow |
86%
Level 1: 80%+
Hints
If the carbon atoms fixed by producers already have passed through three species, the trophic level of the last species would be
| 1. | Scavenger | 2. | Tertiary producer |
| 3. | Tertiary consumer | 4. | Secondary consumer |
Subtopic: Energy Flow |
72%
Level 2: 60%+
Hints
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