Q. No.An inverted pyramid of biomass can be found in which ecosystem?
1. Forest 2. Marine 3. Grassland 4. Tundra
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Which of the following ecosystems is most productive in terms of net primary production?
| 1. | Deserts | 2. | Tropical rainforests |
| 3. | Oceans | 4. | Estuaries |
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Approximately how much of the solar energy that falls on the leaves of a plant is converted to chemical energy by photosynthesis?
| 1. | Less than 1% | 2. | 2-10 % |
| 3. | 30 % | 4. | 50 % |
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How much of the net primary productivity of a terrestrial ecosystem is eaten and digested by herbivores?
| 1. | 1% | 2. | 10% |
| 3. | 40% | 4. | 90% |
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The zone at the edge of a lake or ocean which is alternatively exposed to air and immersed in water is called?
| 1. | Pelagic zone | 2. | Benthic zone |
| 3. | Lentic zone | 4. | Littoral zone |
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Which of the following is an ecosystem service provided by a natural ecosystem?
| 1. | Cycling of nutrients |
| 2. | Prevention of soil erosion |
| 3. | Pollutant absorption and reduction of the threat of global warming |
| 4. | All of the above |
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| Assertion (A): | Various adaptations have evolved in plants that can increase their uptake of nutrients. |
| Reason (R): | Plants are unable to ‘choose’ their environment as they are unable to move about. |
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | Both (A) and (R) are false. |
- If both the assertion and the reason are true and the reason is a correct explanation of the assertion
- If both the assertion and reason are true but the reason is not a correct explanation of the assertion
- If the assertion is true but the reason is false
- If both the assertion and reason are false
| Assertion (A): | Most of an ecosystem’s production is eventually consumed by detritivores and decomposers. |
| Reason (R): | Energy is said to flow through, not cycle within, ecosystems. |
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | Both (A) and (R) are false. |
- If both the assertion and the reason are true and the reason is a correct explanation of the assertion
- If both the assertion and reason are true but the reason is not a correct explanation of the assertion
- If the assertion is true but the reason is false
- If both the assertion and reason are false
| Assertion (A): | Most food chains or webs have only about four or five trophic levels. |
| Reason (R): | Trophic efficiencies are generally only about 10% in different ecosystems. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | Both (A) and (R) are False. |
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