Assertion (A): | The primary acceptor of carbon dioxide in C3 plants is a 2-carbon compound. |
Reason (R): | The first product of carbon dioxide fixation in these plants is a C3 acid. |
1. | (A) is True but (R) is False |
2. | Both (A) and (R) are True and (R) explains (A) |
3. | Both (A) and (R) are True but (R) does not explain (A) |
4. | (A) is False but (R) is True |
1. | 1 | 2. | 3 |
3. | 4 | 4. | 5 |
I: | Tropical plants have a lower temperature optimum than the plants adapted to temperate climates. |
II: | The C4 plants respond to higher temperatures and show higher rate of photosynthesis while C3 plants have a much lower temperature optimum. |
1. | Five G3P molecules produce three RuBP molecules, using up three molecules of ATP. |
2. | Three G3P molecules produce five RuBP molecules, using up three molecules of ATP. |
3. | Three G3P molecules produce five RuBP molecules, using up five molecules of ATP. |
4. | Five G3P molecules produce three RuBP molecules, using up five molecules of ATP. |
Statement I: | CO2 is initially incorporated into a four-carbon organic acid (either malate or aspartate) in the mesophyll cells. |
Statement II: | The chloroplasts of the bundle sheath cells convert this CO2 into carbohydrates by the conventional C3 pathway. |
I: | is the most abundant enzyme in the world |
II: | is characterised by the fact that its active site can bind to both CO2 and O2 |
III: | has a much greater affinity for CO2 when the CO2: O2 is nearly equal |
Assertion (A): | Except for plants in shade or in dense forests, light is rarely a limiting factor for photosynthesis in nature. |
Reason (R): | Increase in incident light beyond a point causes the breakdown of chlorophyll and a decrease in photosynthesis. |
1. | (A) is True but (R) is False |
2. | Both (A) and (R) are True and (R) explains (A) |
3. | Both (A) and (R) are True but (R) does not explain (A) |
4. | (A) is False but (R) is True |