Q. No.A functional unit of nature, where living organisms interact among themselves and also with the surrounding physical environment, is called as:
1. A population 2. A species 3. A biological community 4. An ecosystem
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| Statement I: | Entire biosphere is regarded as a global ecosystem by many ecologists. |
| Statement II: | The global ecosystem is divided into terrestrial and aquatic ecosystem for convenience. |
| 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. |
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| 1. | Stratification | 2. | Scarification |
| 3. | Standing crop | 4. | Standing state |
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| 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. |
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.
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| Statement I: | Tropical land areas have the highest rates of production. |
| Statement II: | Oceans have low productivity. |
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.
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| Statement I: | The terms detritivore and decomposer describe same organisms. |
| Statement II: | Both are unable to ingest discrete lumps of matter, but instead live by absorbing and metabolizing on a molecular scale. |
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.
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| 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). |
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| 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.
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| Statement I: | A is primary succession and B is secondary succession. |
| Statement II: | A will be much faster in pace than B. |
2. Only Statement II is correct.
3. Both Statement I and Statement II are correct.
4. Both Statement I and Statement II are incorrect.
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| 1 | 2 | 3 | 4 | |
| A. | Phyto- plankton |
Zoo- plankton |
Phyto- plankton |
Phyto- plankton |
| B. | Submerged plant | Submerged free floating plant |
Submerged plant | Reed swamp |
| C. | Submerged free floating plant | Reed swamp | Scrub | Submerged plant |
| D. | Reed swamp | Marsh meadow | Submerged free floating plant |
Marsh meadow |
| E. | Marsh meadow | Scrub | Reed swamp | Submerged free floating plant |
| F. | Scrub | Submerged plant |
Marsh meadow | Scrub |
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