- 1(current)
Q. No.Which of the following statements about RuBisCO is true?
| 1. | It is an enzyme involved in the photolysis of water. |
| 2. | It catalyzes the carboxylation of RuBP, |
| 3. | It is active only in the dark. |
| 4. | It has higher affinity for oxygen than carbon dioxide. |
Subtopic: Â Dark Reaction : Calvin Cycle |
 76%
Level 2: 60%+
NEET - 2025
Please attempt this question first.
Hints
Please attempt this question first.
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%
Level 2: 60%+
NEET - 2024
Hints
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%
Level 2: 60%+
NEET - 2024
Hints
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. | 3-carbon molecule, phosphoenol pyruvate |
| 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 |
 80%
Level 1: 80%+
NEET - 2024
Hints
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%
Level 1: 80%+
NEET - 2024
Hints
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%
Level 1: 80%+
NEET - 2024
Hints
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%
Level 1: 80%+
NEET - 2023
Hints
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%
Level 3: 35%-60%
NEET - 2022
Hints
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 |
Level 4: Below 35%
NEET - 2022
Hints
- 1(current)
Q. No.
© 2025 GoodEd Technologies Pvt. Ltd.