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Q. No.On chromatogram, which of the following photosynthetic pigments appears yellow to yellow-orange?
1.
Chlorophyll a
2.
Chlorophyll b
3.
Xanthophylls
4.
Carotenoids
Subtopic: Photosynthetic Pigments |
77%
From NCERT
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Consider the given two statements:
| Assertion (A): | Accessory photosynthetic pigments in higher plants enable a wider range of wavelength of incoming light to be utilised for photosynthesis. |
| Reason (R): | Accessory pigments protect chlorophyll a from photo-oxidation. |
| 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: Photosynthetic Pigments |
71%
From NCERT
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Consider the two statements:
| Statement I: | The electrons that are removed from photosystem II are replaced by electrons available due to splitting of water. |
| Statement II: | The electrons needed to replace those removed from photosystem I are provided by photosystem II. |
| 1. | Statement I is correct; Statement II is incorrect |
| 2. | Statement I is correct; Statement II is correct |
| 3. | Statement I is incorrect; Statement II is incorrect |
| 4. | Statement I is incorrect; Statement II is correct |
Subtopic: Chemiosmotic hypothesis |
88%
From NCERT
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Identify the incorrect statement:
| 1. | When only PS I is functional, the electron is circulated within the photosystem and the phosphorylation occurs due to cyclic flow of electrons. |
| 2. | A possible location of cyclic flow of electrons is in the stroma lamellae. |
| 3. | The stroma lamellae membranes have both PS II as well as NADP reductase enzyme. |
| 4. | When only PS I is functional, the electron is circulated within the photosystem and the phosphorylation occurs due to cyclic flow of electrons. |
Subtopic: Light Reaction: Electron Transport | Light Reaction: Photophosphorylation | Light Reactions :1 | Light Reactions :2 | Light Reactions :3 |
92%
From NCERT
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Consider the given two statements:
| Assertion (A): | Electron transport via cytochrome b6f is responsible for creating the proton gradient that drives the synthesis of ATP in chloroplasts. |
| Reason (R): | Cytochrome b6f complex functions to mediate the transfer of electrons and of energy between Photosystem II and Photosystem I, while transferring protons from the chloroplast stroma across the thylakoid membrane into the lumen. |
| 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 |
71%
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Consider the given two statements:
| Assertion (A): | Immediately after light becomes unavailable, the biosynthetic process continues for some time, and then stops. |
| Reason (R): | The biosynthetic phase of photosynthesis depends on the products of the light 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 | Factors Affecting Photosynthesis | Light Reactions :1 | Light Reactions :2 | Light Reactions :3 |
90%
From NCERT
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A C3 plant is provided CO2 labelled with a radioactive isotope. In the chloroplast, during the process of photosynthesis, the radioactivity is expected to appear first in:
1. RuBP
2. PEP
3. OAA
4. PGA
1. RuBP
2. PEP
3. OAA
4. PGA
Subtopic: Photorespiration |
70%
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Which of the following photosynthetic plants use Calvin pathway for synthesis of sugar?
| I: | C3 plants |
| II: | C4 plants |
| III: | CAM plants |
| 1. | Only I and II |
| 2. | Only I and III |
| 3. | Only II and III |
| 4. | I, II and III |
Subtopic: Dark Reaction : Calvin Cycle |
78%
From NCERT
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In C4 plants:
| I: | The primary CO2 acceptor is a 3-carbon molecule phosphoenol pyruvate (PEP) and is present in the mesophyll cells. |
| II: | The mesophyll cells lack RuBisCO enzyme. |
| III: | The C4 acid OAA is formed in the bundle sheath cells. |
| 1. | Only I and II are correct |
| 2. | Only I and III are correct |
| 3. | Only II and III are correct |
| 4. | I, II, III are correct |
Subtopic: C4 Cycle (Hatch & Slack Pathway) | C4 Plants Examples |
74%
From NCERT
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When the CO2: O2 is nearly equal:
| 1. | RuBisCO has a much greater affinity for CO2 |
| 2. | RuBisCO has a much greater affinity for O2 |
| 3. | RuBisCO has an equal affinity for CO2 and O2 |
| 4. | RuBisCO has no affinity for CO2 |
Subtopic: Photorespiration |
84%
From NCERT
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