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Q. No.Consider the two statements:
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.
Subtopic: Introduction |
93%
Level 1: 80%+
Hints
Vertical distribution of different species occupying different levels in an ecosystem is called:
| 1. | Stratification | 2. | Scarification |
| 3. | Standing crop | 4. | Standing state |
Subtopic: Introduction |
93%
Level 1: 80%+
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 |
88%
Level 1: 80%+
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: | Tropical land areas have the highest rates of production. |
| Statement II: | Oceans have low productivity. |
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: Ecosystem Productivity |
84%
Level 1: 80%+
Hints
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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: | 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. |
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: Decomposition |
Level 3: 35%-60%
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 |
61%
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
Study the given figures 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: | 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.
Subtopic: Ecological Succession (OLD NCERT) |
81%
Level 1: 80%+
Hints
Identify A-F in the diagrammatic representation of primary hydrarch ecological succession:
| 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 |
Subtopic: Ecological Succession (OLD NCERT) |
50%
Level 3: 35%-60%
Hints
Given below is a simplified model of phosphorus cycle in an ecosystem. Select the correct statements:
| Statement I: | Rocks are the natural reservoirs where phosphorus is present in the form of phosphates. |
| Statement II: | Minute amounts of phosphates dissolve in soil solution when rocks are weathered and are absorbed by the roots of the plants. |
| Statement III: | Herbivores and other animals obtain phosphorus from plants. |
| Statement IV: | Phosphate solubilising bacteria decompose waste products and dead organisms releasing phosphorus. |
| Statement V: | Gaseous exchange of phosphorus between organisms and environment is significant. |
| 1. | All except Statement V are correct. |
| 2. | All except Statement I and Statement V are correct. |
| 3. | Only Statement I, Statement II and Statement III are correct. |
| 4. | All Statements are correct. |
Subtopic: Nutrient Cycling (OLD NCERT) |
71%
Level 2: 60%+
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