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Q. No.At low light conditions which of the following plants will respond to high carbon dioxide conditions?
1. Only A
2. Only B
3. Both A and B
4. Neither A nor B
| A: | C3 |
| B: | C4 |
2. Only B
3. Both A and B
4. Neither A nor B
Subtopic: Â Factors Affecting Photosynthesis |
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From NCERT
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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: Â Factors Affecting Photosynthesis |
From NCERT
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Consider the given two statements:
| Assertion (A): | The effect of water as a factor is more indirect rather than direct on photosynthesis. |
| Reason (R): | Water is one of the reactants in the light reaction. |
| 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: Â Factors Affecting Photosynthesis |
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From NCERT
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Given below are two statements:
| Assertion (A): | At any point, the rate of photosynthesis will be determined by the factor available at sub-optimal levels. |
| Reason (R): | During photosynthesis, usually one factor affecting CO2 fixation is the major cause that limits its rate. |
| 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. |
Subtopic: Â Factors Affecting Photosynthesis |
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From NCERT
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The limiting factor of photosynthesis which is most likely to have the greatest effect on plants that are grown in an open field during a hot summer day will be:
1. Carbon dioxide concentration
2. Light intensity
3. Temperature
4. Water
1. Carbon dioxide concentration
2. Light intensity
3. Temperature
4. Water
Subtopic: Â Factors Affecting Photosynthesis |
From NCERT
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