Q. No.Which of the following are required for the dark reaction of photosynthesis?
Choose the correct answer from the options given below:
| A: | Light |
| B: | Chlorophyll |
| C: | CO2 |
| D: | ATP |
| E: | NADPH |
Choose the correct answer from the options given below:
| 1. | B, C and D only |
| 2. | C, D and E only |
| 3. | D and E only |
| 4. | A, B and C only |
Subtopic: Â Dark Reaction: Biosynthetic Phase |Â Dark Reaction : Calvin Cycle |
 65%
From NCERT
NEET - 2024
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How many molecules of ATP and NADPH are required for every molecule of \(\text{CO}_2\) fixed in the Calvin cycle?
| 1. | 2 molecules of ATP and 2 molecules of NADPH |
| 2. | 3 molecules of ATP and 3 molecules of NADPH |
| 3. | 3 molecules of ATP and 2 molecules of NADPH |
| 4. | 2 molecules of ATP and 3 molecules of NADPH |
Subtopic: Â Dark Reaction : Calvin Cycle |
 79%
From NCERT
NEET - 2024
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Given below are two statements:
In the light of the above statements, choose the correct answer from the option given below:
| Statement I: | In \(\text{C}_3\) plants, some \( \text{O}_2\) binds to \(\text{RuBisCO},\) hence \(\text{CO}_2\) fixation is decreased. |
| Statement II: | In \( \text{C}_4\) plants, mesophyll cells show very little photorespiration while bundle sheath cells do not show photorespiration. |
In the light of the above statements, choose the correct answer from the option given below:
| 1. | Both Statement I and Statement II are False |
| 2. | Statement I is True but Statement II is False |
| 3. | Statement I is False but Statement II is True |
| 4. | Both Statement I and Statement II are True |
Subtopic: Â Dark Reaction : Calvin Cycle |Â C4 Cycle (Hatch & Slack Pathway) |Â Photorespiration |
 61%
From NCERT
NEET - 2024
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Match List-I with List-II
Choose the correct answer from the options given below:
| List-I | List-II | ||
| A | C4 Pathway | I. | \(2\text{H}_2\text{O}\rightarrow4\text{H}^++\text{O}_2=4\text{e}^-\) |
| B. | Light reaction | II. | Ribulose 1,5-bisphosphate |
| C. | Photorespiration | III. | -carbon molecule phosphoenol |
| D. | Calvin cycle | IV. | Phosphoglycolate |
| 1. | A-II, B-I, C-IV, D-III |
| 2. | A-IV, B-II, C-I, D-III |
| 3. | A-III, B-I, C-IV, D-II |
| 4. | A-III, B-IV, C-II, D-I |
Subtopic: Â Photosystems |Â Dark Reaction : Calvin Cycle |Â C4 Cycle (Hatch & Slack Pathway) |Â Photorespiration |
 81%
From NCERT
NEET - 2024
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How many molecules of ATP and NADPH are required, respectively, for fixation of every CO2 molecule entering the Calvin cycle?
1. 2 and 4
2. 4 and 2
3. 3 and 2
4. 2 and 3
1. 2 and 4
2. 4 and 2
3. 3 and 2
4. 2 and 3
Subtopic: Â Dark Reaction : Calvin Cycle |
 91%
From NCERT
NEET - 2024
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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: Â Dark Reaction : Calvin Cycle |
 90%
From NCERT
NEET - 2024
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How many ATP and NADPH2 are required for the synthesis of one molecule of glucose during Calvin cycle?
| 1. | 18 ATP and 16 NADPH2 |
| 2. | 12 ATP and 12 NADPH2 |
| 3. | 18 ATP and 12 NADPH2 |
| 4. | 12 ATP and 16 NADPH2 |
Subtopic: Â Dark Reaction : Calvin Cycle |
 89%
From NCERT
NEET - 2023
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The ratio of carbon dioxide fixation between C4 plants and C3 plants is :
| 1. | 2:1 | 2. | 2: 3 |
| 3. | 1:1 | 4. | 1:2 |
Subtopic: Â Dark Reaction : Calvin Cycle |Â C4 Cycle (Hatch & Slack Pathway) |
 57%
From NCERT
NEET - 2022
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When one CO2 molecule is fixed as one molecule of triose phosphate, which of the following photochemically made, high energy chemical intermediates are used in the reduction phase?
1. 1 ATP + 1 NADPH
2. 1 ATP + 2 NADPH
3. 2 ATP + 1 NADPH
4. 2 ATP + 2 NADPH
1. 1 ATP + 1 NADPH
2. 1 ATP + 2 NADPH
3. 2 ATP + 1 NADPH
4. 2 ATP + 2 NADPH
Subtopic: Â Dark Reaction : Calvin Cycle |
From NCERT
NEET - 2022
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In C3 plants, the first stable product of photosynthesis during the dark reaction is:
1. Oxaloacetic acid
2. 3-phosphoglyceric acid
3. Phosphoglyceraldehyde
4. Malic acid
Subtopic: Â Dark Reaction : Calvin Cycle |
 82%
From NCERT
AIPMT - 2004
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