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Q. No.Regarding the temperature optimum for photosynthesis of different plants:
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. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
Subtopic: Factors Affecting Photosynthesis |
71%
From NCERT
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Consider the two statements:
Assertion: The light-independent reactions do not require light, but they are most likely to occur during the day.
Reason: NADPH and ATP from the light-dependent reactions are used in the light-independent reactions.
1. Assertion is true but Reason is false
2. Both Assertion and Reason are true and Reason explains Assertion
3. Both Assertion and Reason are true but Reason does not explain Assertion
4. Assertion is false but Reason is true
Assertion: The light-independent reactions do not require light, but they are most likely to occur during the day.
Reason: NADPH and ATP from the light-dependent reactions are used in the light-independent reactions.
1. Assertion is true but Reason is false
2. Both Assertion and Reason are true and Reason explains Assertion
3. Both Assertion and Reason are true but Reason does not explain Assertion
4. Assertion is false but Reason is true
Subtopic: WHERE ARE THE ATP AND NADPH USED |
65%
From NCERT
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In the ‘Regeneration’ stage of the Calvin cycle:
| 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. |
Subtopic: Dark Reaction : Calvin Cycle |
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C4 carbon fixation, one of three known photosynthetic processes of carbon fixation in plants, is also called as:
1. Calvin Benson cycle
2. Tricarboxylic acid cycle
3. Hatch–Slack pathway
4. Embden-Meyerhof-Parnas pathway
1. Calvin Benson cycle
2. Tricarboxylic acid cycle
3. Hatch–Slack pathway
4. Embden-Meyerhof-Parnas pathway
Subtopic: C4 Cycle (Hatch & Slack Pathway) |
91%
From NCERT
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In C4 plants:
1. Statement I is correct; Statement II is incorrect
2. Statement I is incorrect; Statement II is incorrect
3. Statement I is incorrect; Statement II is correct
4. Statement I is correct; Statement II is correct
| 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. |
1. Statement I is correct; Statement II is incorrect
2. Statement I is incorrect; Statement II is incorrect
3. Statement I is incorrect; Statement II is correct
4. Statement I is correct; Statement II is correct
Subtopic: C4 Cycle (Hatch & Slack Pathway) |
68%
From NCERT
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The source of O2 released during photosynthesis is:
1. carbon dioxide
2. water
3. glucose
4. chlorophyll
1. carbon dioxide
2. water
3. glucose
4. chlorophyll
Subtopic: Light Reaction: Electron Transport |
94%
From NCERT
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RuBisCO:
1. Only I and II are correct
2. Only I and III are correct
3. Only II and III are correct
4. I, II and III are correct
| 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 |
2. Only I and III are correct
3. Only II and III are correct
4. I, II and III are correct
Subtopic: Photorespiration |
88%
From NCERT
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Consider the two statements:
| 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 |
Subtopic: Factors Affecting Photosynthesis |
71%
From NCERT
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Consider the two statements:
| Assertion (A): | Current availability of CO2 levels is limiting to the C3 plants. |
| Reason (R): | Carbon dioxide is the major limiting factor for 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 |
Subtopic: Factors Affecting Photosynthesis |
56%
From NCERT
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‘The effect of water as a factor affecting photosynthesis is more through its effect on the plant, rather than directly on photosynthesis’. Which of the following support this statement?
1. Only I
2. Only II
3. Both I and II
4. Neither I nor II
| I: | Water stress causes the stomata to close, hence reducing the CO2 availability. |
| II: | Water stress also makes leaves wilt, thus, increasing the surface area of the leaves and their metabolic activity as well. |
1. Only I
2. Only II
3. Both I and II
4. Neither I nor II
Subtopic: Factors Affecting Photosynthesis |
70%
From NCERT
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