- 1(current)
Q. No.| Assertion (A): | The current atmospheric carbon dioxide concentration is limiting to C3 plants and not to C4 plants. |
| Reason (R): | The C4 plants and C3 plants respond differently to carbon dioxide concentration. |
| 1. | Both (A) and (R) are True and (R) correctly explains (A). |
| 2. | Both (A) and (R) are True and (R) does not correctly explain (A). |
| 3. | (A) is True; (R) is False |
| 4. | Both (A) and (R) are False |
Subtopic: Factors Affecting Photosynthesis |
Level 3: 35%-60%
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Consider the given two statements:
| Assertion (A): | Light is rarely a limiting factor for photosynthesis in higher plants. |
| Reason (R): | Light saturation occurs at 10 per cent of the full sunlight. |
| 1. | Both (A) and (R) are True and (R) correctly explains (A). |
| 2. | Both (A) and (R) are True but (R) does not correctly explain (A). |
| 3. | (A) is True but (R) is False |
| 4. | Both (A) and (R) are False |
Subtopic: Factors Affecting Photosynthesis |
82%
Level 1: 80%+
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Consider the given two statements:
| Assertion (A): | Light is rarely a limiting factor for photosynthesis under natural conditions. |
| Reason (R): | Other factors like CO2 concentration and temperature more often limit the rate of photosynthesis. |
| 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. | (A) is False but (R) is True. |
Subtopic: Factors Affecting Photosynthesis |
72%
Level 2: 60%+
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The difference in the effect of increasing carbon dioxide concentration on C3 and C4 plants is that:
| 1. | C3 plants show a higher rate of photosynthesis than C4 plants at low CO2 concentration |
| 2. | C3 plants show a higher rate of photosynthesis than C4 plants at high CO2 concentration |
| 3. | C3 plants' photosynthesis rate decreases at higher CO2 concentrations, unlike C4 plants |
| 4. | C4 plants are more efficient in photosynthesis at lower CO2 concentrations |
Subtopic: Factors Affecting Photosynthesis |
Level 3: 35%-60%
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Consider the two statements:
| I: | Current availability of carbon dioxide levels is limiting to the C4 plants. |
| II: | C3 plants have a much lower temperature optimum than C4 plants. |
| 1. | Only I is correct | 2. | Only II is correct |
| 3. | Both I and II are correct | 4. | Both I and II are incorrect |
Subtopic: C4 Cycle (Hatch & Slack Pathway) | C4 Plants Examples | Factors Affecting Photosynthesis |
64%
Level 2: 60%+
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- 1(current)
Q. No.
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