- 1(current)
Q. No.| Assertion (A): | Strongly vertically stratified habitats are very stable ecosystems. |
| Reason (R): | Through the formation of different layers a given habitat is better utilized. |
| 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
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 type of ecosystem is expected in an area where evaporation exceeds precipitation, and mean annual rainfall is below 100 mm?
1. Grassland
2. Shrubby forest
3. Desert
4. Mangrove
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The most relevant abiotic ecological factor for organisms is:
| 1. | Temperature | 2. | Water |
| 3. | Light | 4. | Soil |
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Nitrogen is often a limiting nutrient in terrestrial ecosystems because:
| 1. | the percentage of nitrogen in the atmosphere is low |
| 2. | atmospheric nitrogen is primarily in the stratosphere |
| 3. | dinitrogen cannot be used directly by the organisms |
| 4. | there are regional fluctuations in nitrogen levels in the atmosphere |
| 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
The ecosystem that can survive in the absence of the Sun would be:
| 1. | tropical rainforest | 2. | tundra |
| 3. | benthic ocean | 4. | desert |
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- 1(current)
Q. No.
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