Q. No.Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
| Assertion (A): | Dark reactions of photosynthesis can take place only in the absence of light. |
| Reason (R): | Dark reactions are dependent on the products of the light reactions. |
| 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 (A). |
| 3. | (A) is True but (R) is False. |
| 4. | (A) is False but (R) is True. |
Subtopic: Â Chloroplast Structure |Â Pigments |
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Which of following pigments participates directly in the light reactions of photosynthesis?
1. Chlorophyll a
2. Chlorophyll b
3. Chlorophyll d
4. Carotenoids
Subtopic: Â Pigments |
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Level 1: 80%+
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Consider the given statements:
1. Both Statement I and Statement II are correct
2. Both Statement I and Statement II are incorrect
3. Statement I is correct but Statement II is incorrect
4. Statement I is incorrect but Statement II is correct
| Statement I: | Chlorophyll a is the chief pigment involved in photosynthesis, which absorbs light in the blue and red regions of the spectrum. |
| Statement II: | Chlorophyll b and carotenoids function primarily as accessory pigments to extend the range of light absorption. |
1. Both Statement I and Statement II are correct
2. Both Statement I and Statement II are incorrect
3. Statement I is correct but Statement II is incorrect
4. Statement I is incorrect but Statement II is correct
Subtopic: Â Pigments |
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Accessory pigments like chlorophyll b, xanthophylls, and carotenoids are essential for photosynthesis. How do they assist in light absorption?
| 1. | They absorb light across a broader wavelength range and transfer energy to chlorophyll a. |
| 2. | They participate directly in the photolysis of water. |
| 3. | They convert absorbed light energy into ATP without electron transport. |
| 4. | They prevent excessive absorption of light, thereby reducing photosynthetic efficiency. |
Subtopic: Â Pigments |
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Level 1: 80%+
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Photosynthetic active radiation (PAR) has which of the following range of wavelength?
1. 400-700 nm
2. 450-920 nm
3. 340-450 nm
4. 500-600 nm
Subtopic: Â Pigments |
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Level 1: 80%+
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What does the action spectrum of photosynthesis show?
| 1. | The absorption of light by chlorophyll only. |
| 2. | The rate of photosynthesis at different wavelengths of light. |
| 3. | The energy stored in chlorophyll molecules. |
| 4. | The oxygen released during respiration. |
Subtopic: Â Pigments |
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Level 1: 80%+
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Which of the following is correct?
1. Only I
2. Only II
3. Both I and II
4. Neither I nor II
| I: | The wavelengths at which there is maximum absorption by chlorophyll a, i.e., in the blue and the red regions of visible spectrum of light, also shows higher rate of photosynthesis. |
| II: | Chlorophyll a is the chief pigment associated with photosynthesis. |
2. Only II
3. Both I and II
4. Neither I nor II
Subtopic: Â Pigments |
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Level 1: 80%+
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Which of the following is true about chlorophyll b?
| 1. | Serves as major primary pigment in the photosynthetic machinery |
| 2. | Forms the reaction center only |
| 3. | Prevent reaction center from photo-oxidation |
| 4. | Show blue color in chromatogram |
Subtopic: Â Pigments |
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The reaction-center chlorophyll of a photosystem in higher plant is:
| 1. | chlorophyll a | 2. | chlorophyll b |
| 3. | chlorophyll c | 4. | chlorophyll d |
Subtopic: Â Pigments |
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What are the main components of a photosystem in photosynthesis?
| 1. | Chlorophyll molecules, reaction centre, and light-harvesting complex |
| 2. | ATP synthase, electron carriers, and NADPH |
| 3. | Carbohydrate molecules, thylakoid lumen, and oxygen |
| 4. | Stroma enzymes, plastids, and ribosomes |
Subtopic: Â Introduction |Â Photosynthetic Pigments |Â Pigments |Â Light Reactions |
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Level 1: 80%+
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