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Q. No.The colour/s of visible light that work/s least well for photosynthesis is/are:
1. Red and Blue
2. Violet and Yellow
3. Green
4. Yellow
Subtopic: Pigments |
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A part of a leaf is enclosed in a test tube containing some KOH soaked cotton, while the other half is exposed to air. The setup is then placed in light for some time. Later, the exposed part of the leaf tested positive for starch, while the portion that was in the tube, tested negative. This showed that:
| I: | CO2 was required for photosynthesis |
| II: | Light is not essential for carbon fixation in photosynthesis. |
| 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: Introduction | Historical View: Experiments |
89%
From NCERT
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Consider the given two statements:
| Assertion: | The alignment of the chloroplasts along the walls of the mesophyll cells vary depending on the amount of incident light. |
| Reason: | The alignment of the chloroplasts along the walls of the mesophyll cells is such that they get the optimum quantity of the incident light. |
| 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: Factors Affecting Photosynthesis |
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There is a clear division of labour within the chloroplast where:
| I: | the membrane system is responsible for trapping the light energy and for the synthesis of ATP and NADPH. |
| II: | in stroma, enzymatic reactions synthesise sugar, which in turn forms starch and synthesis of ATP but not NADPH takes place. |
| 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: Chloroplast Structure |
65%
From NCERT
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Light Harvesting Complex (LHC) or antenna of a photosystem includes all the following except:
1. Chlorophyll a
2. Chlorophyll b
3. Xanthophylls
4. Carotenoids
1. Chlorophyll a
2. Chlorophyll b
3. Xanthophylls
4. Carotenoids
Subtopic: Light Reaction: Photophosphorylation | Light Reactions :1 | Light Reactions :2 | Light Reactions :3 |
89%
From NCERT
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Identify the correct statements:
| I: | Photosystem I (PS I) functions before Photosystem II (PS II) during the light reaction. |
| II: | In PS I, the reaction centre chlorophyll a has an absorption peak at 680 nm, hence is called P680. |
| III: | In PS II, the reaction centre chlorophyll a has absorption maxima at 700 nm, and is called P700. |
| 1. | Only I |
| 2. | Only II and III |
| 3. | I, II and III |
| 4. | All are incorrect |
Subtopic: Light Reactions :1 | Light Reactions :2 | Light Reactions :3 |
87%
From NCERT
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Production of ATP through phosphorylation in a eukaryotic cell can take place in:
| I: | Cytosol |
| II: | Mitochondria |
| III: | Chloroplasts |
| 1. | Only I |
| 2. | Only II and III |
| 3. | Only I and II |
| 4. | I, II and III |
Subtopic: Chloroplast Structure |
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The reduction of NADP + to NADPH + H+ during non-cyclic photophosphorylation directly requires:
| I: | electrons that come from water. |
| II: | protons that are removed from 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: Light Reaction: Photophosphorylation | Light Reactions :1 | Light Reactions :2 | Light Reactions :3 | Light Reactions |
59%
From NCERT
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Consider the two statements:
| Assertion(A): | Breakdown of proton gradient across the thylakoid membrane leads to the synthesis of ATP. |
| Reason(R): | The gradient is broken down due to the movement of protons across the membrane to the stroma through the transmembrane channel of the CF0 of the ATP synthase. |
| 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: Chemiosmotic hypothesis |
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Consider the given two statements:
| Assertion(A): | The enzyme that catalyses carboxylation of RuBP in Calvin cycle would be more correctly called RuBisCO rather than RuBP carboxylase. |
| Reason(R): | This enzyme also has an oxygenation activity apart from a carboxylase activity. |
| 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: Dark Reaction : Calvin Cycle |
86%
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