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Q. No.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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Consider the two statements regarding the photorespiratory pathway:
| Statement I: | There is neither synthesis of sugars, nor of ATP. |
| Statement II: | It results in the release of CO2 with the utilisation of ATP. |
| 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: Light Reaction: Electron Transport | Dark Reaction: Biosynthetic Phase | Dark Reaction : Calvin Cycle | C4 Cycle (Hatch & Slack Pathway) | C4 Plants Examples | CAM Pathway | Photorespiration |
82%
From NCERT
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The limiting factor of photosynthesis which is most likely to have the greatest effect on plants that are grown in an open field during a hot summer day will be:
1. Carbon dioxide concentration
2. Light intensity
3. Temperature
4. Water
1. Carbon dioxide concentration
2. Light intensity
3. Temperature
4. Water
Subtopic: Factors Affecting Photosynthesis |
From NCERT
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Photosynthesis takes place in:
| 1. | animals only |
| 2. | plants only |
| 3. | plants, algae, some bacteria, some protists |
| 4. | only plants and animals |
Subtopic: Historical View: Experiments | Redtrop Experiment | Emerson's Enhancement Experiment |
92%
From NCERT
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