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Q. No.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%
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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. |
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: Mineral Cycling & Ecosystem Services (OLD NCERT) |
90%
From NCERT
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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. |
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: Ecosystem Productivity |
84%
From NCERT
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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. |
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: Decomposition |
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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%
From NCERT
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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: | 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 |
91%
From NCERT
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The given figure shows pyramid of numbers in a grassland ecosystem. What will be be true for pyramid of numbers?
| I: | A pyramid of numbers shows graphically the population, or abundance, in terms of the number of individual organisms involved at each level in a food chain. |
| II: | The pyramid shows the number of organisms in each trophic level and it does not consider individual sizes or biomass. |
| III: | It is not necessary that the pyramid is always upright. For example, it will be inverted if beetles are feeding from the output of forest trees, or parasites are feeding on large host animals. |
| 1. | Only I and II |
| 2. | Only I and III |
| 3. | Only II and III |
| 4. | I, II and III |
Subtopic: Ecological Pyramids |
76%
The given pyramid of biomass shows a sharp decrease in biomass at higher trophic levels. What can be the reason for this sharp decrease?
| I: | The respiration cost increases sharply along successive higher trophic levels. |
| II: | There can be lower amounts of biomass at the bottom of the pyramid if the rate of primary production per unit biomass is high. |
| 1. | Both I and II are correct and II explains I. |
| 2. | Both I and II are correct but II does not explain I. |
| 3. | I is correct but II is incorrect. |
| 4. | I is incorrect but II is correct. |
Subtopic: Ecological Pyramids |
The figure shows an inverted pyramid of biomass. What will be true for such a pyramid?
| I: | An example of such a pyramid will be the pyramid of biomass in a pond ecosystem, where the standing crop of phytoplankton, the major producers, at any given point will be lower than the mass of the heterotrophs. |
| II: | The phytoplankton reproduce very quickly, but have much shorter individual lives. |
| 1. | Both I and II are correct and II explains I. |
| 2. | Both I and II are correct but II does not explain I. |
| 3. | I is correct but II is incorrect. |
| 4. | I is incorrect but II is correct. |
Subtopic: Ecological Pyramids |
71%
Study the representation of an ideal pyramid of energy in the given figure. Which of the following will be true regarding this pyramid?
| 1. | The rate of production over a period of time is not taken into account. |
| 2. | Two species of comparable biomass may have very different life spans. Thus, a direct comparison of their total biomasses is misleading, but their productivity is directly comparable. |
| 3. | The relative energy chain within an ecosystem cannot be compared using pyramids of energy; also different ecosystems cannot be compared. |
| 4. | It can be inverted in certain ecosystems. |
Subtopic: Ecological Pyramids |
65%
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