Q. No.Light reactions or the ‘Photochemical’ phase of photosynthesis in higher plants include all the following except:
| 1. | light absorption | 2. | water splitting |
| 3. | oxygen release | 4. | carbon fixation |
Subtopic: Dark Reaction : Calvin Cycle |
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The enzyme directly responsible for almost all carbon fixation on Earth is
1. rubisco
2. PEP carboxylase
3. ATP synthase
4. phosphofructokinase
1. rubisco
2. PEP carboxylase
3. ATP synthase
4. phosphofructokinase
Subtopic: Dark Reaction : Calvin Cycle |
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Which of the following correctly represents the three main stages of the Calvin cycle in the correct order?
| 1. | Reduction, Carboxylation, Regeneration |
| 2. | Carboxylation, Reduction, Regeneration |
| 3. | Regeneration, Carboxylation, Reduction |
| 4. | Reduction, Regeneration, Carboxylation |
Subtopic: Dark Reaction : Calvin Cycle |
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Consider the given two statements:
| Statement I: | The first stable product of the Calvin cycle is 3-phosphoglyceric acid (3-PGA). |
| Statement II: | The Calvin cycle is also known as the C3 pathway. |
| 1. | Statement I is correct; Statement II is correct |
| 2. | Statement I is correct; Statement II is incorrect |
| 3. | Statement I is incorrect; Statement II is correct |
| 4. | Statement I is incorrect; Statement II is incorrect |
Subtopic: Dark Reaction : Calvin Cycle |
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For every CO2 molecule entering the Calvin cycle:
| 1. | 3 molecules of ATP and 2 of NADPH are required. |
| 2. | 3 molecules of ATP and 3 of NADPH are required. |
| 3. | 2 molecules of ATP and 3 of NADPH are required. |
| 4. | 2 molecules of ATP and 2 of NADPH are required. |
Subtopic: Dark Reaction : Calvin Cycle |
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In the Calvin cycle, for the synthesis of one molecule of glucose, how many molecules of ATP and NADPH are required, respectively?
1. 18 ATP and 12 NADPH
2. 12 ATP and 18 NADPH
3. 6 ATP and 12 NADPH
4. 18 ATP and 6 NADPH
1. 18 ATP and 12 NADPH
2. 12 ATP and 18 NADPH
3. 6 ATP and 12 NADPH
4. 18 ATP and 6 NADPH
Subtopic: Dark Reaction : Calvin Cycle |
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Given below are two statements:
| Assertion (A): | Enzyme RuBisCO is called as RuBP Carboxylase oxygenase. |
| Reason (R): | RubisCo has both oxygenation and carboxylation activity. |
| 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. | Both (A) and (R) are false. |
Subtopic: Dark Reaction : Calvin Cycle |
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Observe the given figure. Identify the different stages labelled with alphabets by selecting the correct option:
| 1. | A-Carboxylation, B-Regeneration, C-Reduction |
| 2. | A-Reduction, B-Decarboxylation, C-Regeneration |
| 3. | A-Carboxylation, B-Reduction, C-Regeneration |
| 4. | A-Reduction, B-Carboxylation, C-Regeneration |
Subtopic: Dark Reaction : Calvin Cycle |
90%
Level 1: 80%+
NEET - 2024
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Melvin Calvin used ------- radioactive in-----studies for the discovery of the first CO2 fixation product.
1. 14C , Fungal photosynthesis
2. 14C , Algal photosynthesis
3. 15N , Fungal photosynthesis
4. 15N , Algal photosynthesis
Subtopic: Dark Reaction : Calvin Cycle |
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Select the incorrect statement with respect to C3 cycle:
| 1. | For one CO2 fixation, three ATPs are required |
| 2. | Regeneration of the CO2 acceptor molecule RuBP is not crucial for the continuation of the cycle |
| 3. | The first stable product is PGA |
| 4. | Carboxylation is the most crucial step |
Subtopic: Dark Reaction : Calvin Cycle |
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Level 1: 80%+
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