Q. No.
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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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Among the following bio-geo-chemical cycles, which one does not have losses due to respiration?
1. Phosphorus
2. Nitrogen
3. Sulphur
4. All of the above
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The sequence of communities of primary succession in water is :
| 1. | Phytoplankton, sedges, free-floating hydrophytes, rooted hydrophytes, grasses, and trees. |
| 2. | Phytoplankton, free-floating hydrophytes, rooted hydrophytes, sedges, grasses, and trees. |
| 3. | Free-floating hydrophytes, sedges, phytoplankton, rooted hydrophytes, grasses, and trees. |
| 4. | Phytoplankton, rooted submerged hydrophytes, floating hydrophytes, reed swamp, sedges, meadow, and trees. |
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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 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
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