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Q. No.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
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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Non-cyclic electron pathway:
| I: | utilizes both Photosystem I and Photosystem II. |
| II: | will use electrons that come from the splitting of water. |
| 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: Photosystems |
90%
From NCERT
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Regarding the light-independent reactions:
| I: | they occur in the stroma of the chloroplast. |
| II: | NADPH and ATP from the light-dependent reactions are used. |
| III: | Carbon dioxide is oxidized to form a carbohydrate. |
| IV: | they are most likely to occur during the night. |
| 1. | Only I and II are correct |
| 2. | Only I, II and III are correct |
| 3. | Only II, III and IV are correct |
| 4. | I, II, III and IV are correct |
Subtopic: Light Reaction: Electron Transport | Dark Reaction: Biosynthetic Phase | Dark Reaction : Calvin Cycle |
From NCERT
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Both ATP and NADPH, the products from the light-dependent reactions, are required during which of the following stages of the Calvin cycle?
1. carbon dioxide fixation
2. carbon dioxide reduction
3. regeneration of RuBP
4. cyclic electron pathway
1. carbon dioxide fixation
2. carbon dioxide reduction
3. regeneration of RuBP
4. cyclic electron pathway
Subtopic: Dark Reaction : Calvin Cycle |
71%
From NCERT
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