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Q. No.The electrons that are moved from photosystem II are replaced by electron from:
1. PS I
2. Water
3. Glucose
4. Acetyl CoA
Subtopic: Light Reaction: Electron Transport |
90%
From NCERT
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The ATP synthase enzyme consists of two parts where:
| I: | CF0 is embedded in the thylakoid membrane and forms a transmembrane channel that carries out facilitated diffusion of protons across the membrane. |
| II: | CF1 protrudes on the outer surface of the thylakoid membrane on the side that faces the stroma. |
| 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: Chemiosmotic hypothesis |
93%
From NCERT
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The products of light reaction of photosynthesis include all the following except:
1. ATP
2. NADPH
3. Glucose
4. O2
1. ATP
2. NADPH
3. Glucose
4. O2
Subtopic: WHERE ARE THE ATP AND NADPH USED |
87%
From NCERT
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Consider the two statements:
| 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 |
Subtopic: WHERE ARE THE ATP AND NADPH USED |
87%
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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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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Consider the given two statements:
| Assertion (A): | Plants that do not use PEP-carboxylase in primary carbon fixation are called C3 plants. |
| Reason (R): | C3 plants are so called because, the primary carboxylation reaction, catalyzed by RuBisCO, produces the three-carbon 3-phosphoglyceric acids directly in the Calvin-Benson cycle. |
| 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: Dark Reaction : Calvin Cycle | C4 Cycle (Hatch & Slack Pathway) |
50%
From NCERT
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Consider the given two statements:
| Assertion (A): | Water molecules appear on both sides of the equation of photosynthesis. |
| Reason (R): | The molecules that enter the reaction are not the same molecules that emerge from the 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: Light Reaction: Photophosphorylation | Light Reactions :1 | Light Reactions :2 | Light Reactions :3 |
From NCERT
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