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Q. No.Consider the given two statements;
Statement I:
The action spectrum of photosynthesis overlaps completely with the absorption spectrum of chlorophyll a.
Statement II:
Accessory pigments like chlorophyll b, xanthophylls, and carotenoids widen the range of light wavelengths that can be utilized for photosynthesis.
1.
Statement I is correct; Statement II is correct
2.
Statement I is correct; Statement II is incorrect
3.
Statement I is incorrect; Statement II is correct
4.
Statement I is incorrect; Statement II is incorrect
Subtopic: Pigments |
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In the process of photosynthesis, electrons lost by Photosystem II (PS II) must be continuously replaced. Considering the location and function of the water-splitting complex associated with PS II, where are the protons (H⁺) and oxygen (O₂) released?
| 1. | Protons (H⁺) are released into the stroma, and O₂ is released into the lumen of the thylakoid. |
| 2. | Protons (H⁺) are released into the lumen of the thylakoid, and O₂ is released into the stroma. |
| 3. | Both protons (H⁺) and O₂ are released into the lumen of the thylakoid. |
| 4. | Both protons (H⁺) and O₂ are released into the stroma. |
Subtopic: Light Reaction: Electron Transport |
From NCERT
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Consider the given two statements:
Options:
| Assertion (A): | ATP synthesis in chloroplasts depends on a proton gradient. |
| Reason (R): | Protons build up in the space between the outer and inner chloroplast membrane during the light-dependent reactions. |
| 1. | Both (A) and (R) are True and (R) explains (A). |
| 2. | Both (A) and (R) are True but (R) does not explain (A). |
| 3. | (A) is True but (R) is False. |
| 4. | (A) is False but (R) is True. |
Subtopic: Chemiosmotic hypothesis |
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Subtopic: Dark Reaction : Calvin Cycle |
From NCERT
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What is necessary for the reduction of NADP+ to NADPH + H+?
1. Only electrons
2. Only protons
3. Electrons and protons
4. Water molecules
1. Only electrons
2. Only protons
3. Electrons and protons
4. Water molecules
Subtopic: Dark Reaction : Calvin Cycle |
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From NCERT
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How many of the given statements are true?
1. 3
2. 4
3. 5
4. 6
| I: | C3 plants use the Calvin cycle to fix carbon dioxide directly into a three-carbon compound, 3-phosphoglycerate. |
| II: | C4 plants conduct their light-dependent reactions and Calvin cycle in the same cell type. |
| III: | Photosystem I primarily functions to generate ATP, while Photosystem II primarily functions to generate NADPH. |
| IV: | C4 plants separate carbon fixation and the Calvin cycle into two different types of cells to reduce photorespiration. |
| V: | Light-dependent reactions occur in the thylakoid membranes and involve the absorption of light to produce ATP and NADPH. |
| VI: | In C3 plants, photorespiration is promoted by high concentrations of oxygen, especially under high light intensity and temperature conditions. |
1. 3
2. 4
3. 5
4. 6
Subtopic: Questions on Calvin Cycle | Question on C4 Pathway | Questions on Photorespiration |
51%
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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: Factors Affecting Photosynthesis |
58%
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: Factors Affecting Photosynthesis |
From NCERT
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Consider the given two statements:
| Assertion (A): | Chemiosmosis in chloroplasts is crucial for ATP synthesis. |
| Reason (R): | The movement of protons across the thylakoid membrane from the stroma into the thylakoid lumen drives ATP synthesis |
| 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 (R) |
| 3. | (A) is True but (R) is False |
| 4. | (A) is False but (R) is True |
Subtopic: Chemiosmotic hypothesis |
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Who discovered that plants in the presence of light produce a gas that supports combustion, which is part of the process of photosynthesis?
1. Jan Ingenhousz
2. Joseph Priestley
3. Melvin Calvin
4. Robin Hill
1. Jan Ingenhousz
2. Joseph Priestley
3. Melvin Calvin
4. Robin Hill
Subtopic: Historical View: Experiments |
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