Q. No.
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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): | Most ecosystems would vanish if the sun were not continuously providing energy to Earth. |
| Reason (R): | Both energy and matter are transformed in ecosystems through photosynthesis and feeding relationships. |
| 1. | Both (A) and (R) are True and the (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but the (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | Both (A) and (R)are False. |
Assertion: If decomposition stopped, life would cease.
Reason: Detritus would pile up and the ingredients needed to synthesize organic matter would be exhausted.
1. Both assertion and reason are true and the reason is the correct explanation of the assertion.
2. Both assertion and reason are true but the reason is not the correct explanation of the assertion.
3. Assertion is true but reason is false.
4. Both assertion and reason 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: Grasslands do not accumulate as much biomass as forests.
Reason: Grasses and herbs have inefficient photosynthesis as compared to the tall trees.
1. Both assertion and reason are true and the reason is the correct explanation of the assertion.
2. Both assertion and reason are true but the reason is not the correct explanation of the assertion.
3. Assertion is true but reason is false.
4. Both assertion and reason 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): | Light is the main variable limiting primary production in the oceans. |
| Reason (R): | Solar radiation does not drive photosynthesis in oceans. |
| 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. |
| 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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| Assertion (A): | Of all the required nutrients other than nitrogen, phosphorus is the most likely to be scarce enough to limit plant growth. |
| Reason (R): | The reservoir of phosphorus is in the mineral form rather than in the atmosphere. |
| 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
To unlock all the explanations of 38 chapters you need to be enrolled in MasterClass Course.
To unlock all the explanations of 38 chapters you need to be enrolled in MasterClass Course.
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