- 1(current)
Q. No.In the diagram showing relation between Calvin cycle and Photorespiration the molecule labeled X can be:
1. Oxygen
2. Ammonia
3. Nitric oxide
4. Hydrogen sulfide
Subtopic: Â Dark Reaction : Calvin Cycle |Â Photorespiration |
Level 3: 35%-60%
Hints
The 2-carbon compound formed in photorespiration is:
| 1. | Acetyl CoA | 2. | Phosphoglycolate |
| 3. | Acetic acid | 4. | Ethanol |
Subtopic: Â Photorespiration |
 86%
Level 1: 80%+
Hints
C4 plants are special. Which of the following will be true for C4 plants?
| (a) | They have a special type of leaf anatomy |
| (b) | They tolerate higher temperature |
| (c) | They show a response to high light intensities |
| (d) | They lack a process called photorespiration |
| (e) | They have greater productivity of biomass |
| 1. | All except (e) |
| 2. | (b), (c) and (d) only |
| 3. | All |
| 4. | (a), (b), (d) and (e) only |
Subtopic: Â C4 Cycle (Hatch & Slack Pathway) |Â Photorespiration |
 77%
Level 2: 60%+
Hints
Photorespiration is a wasteful process. Why is it so?
| 1. | The number of ATP molecules produced in the pathway is very low. |
| 2. | The number of NADPH molecules produced in the pathway is very low. |
| 3. | The synthesis of sugars in the pathway requires a large input of ATP energy. |
| 4. | There is neither synthesis of sugars, nor of ATP in the pathway. |
Subtopic: Â Photorespiration |
 88%
Level 1: 80%+
Hints
The greatest problem with photorespiration is faced by:
| 1. | C4 plants | 2. | C3 plants |
| 3. | CAM plants | 4. | purple sulfur bacteria |
Subtopic: Â Photorespiration |
 83%
Level 1: 80%+
Hints
The process of photosynthesis has lower efficiency if photorespiration occurs because of the reduced formation of:
| 1. | AcetylCoA | 2. | 3-phosphoglycerate |
| 3. | ATP | 4. | RuBP |
Subtopic: Â Photorespiration |
 64%
Level 2: 60%+
Hints
When the ratio, CO2 : O2 is nearly equal, RuBisCO:
1. has no affinity for oxygen
2. has a much greater affinity for carbon dioxide
3. has a much greater affinity for oxygen
4. has equal affinity for both carbon dioxide and oxygen
1. has no affinity for oxygen
2. has a much greater affinity for carbon dioxide
3. has a much greater affinity for oxygen
4. has equal affinity for both carbon dioxide and oxygen
Subtopic: Â Photorespiration |
 82%
Level 1: 80%+
Hints
In the photorespiratory pathway:
| I: | there is no synthesis of sugars |
| II: | there is release of carbon dioxide with the utilization of ATP |
| III: | ATP is synthesized but NADPH is not synthesized |
| 1. | Only I and II are correct |
| 2. | Only I and III are correct |
| 3. | Only II and III are correct |
| 4. | I, II and III are correct |
Subtopic: Â Photorespiration |
 81%
Level 1: 80%+
Hints
- 1(current)
Q. No.
© 2026 GoodEd Technologies Pvt. Ltd.