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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. | (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: WHERE ARE THE ATP AND NADPH USED |
64%
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 |
Subtopic: C4 Cycle (Hatch & Slack Pathway) |
91%
From NCERT
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In C4 plants:
| 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:
| 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 |
| 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 |
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 |
72%
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 |
54%
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?
| 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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