| Assertion(A): | Plants photosynthesise during the day, whereas they respire at night. |
| Reason(R): | Photosynthesis can occur in the presence of sunlight whereas respiration cannot. |
| 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. |
| Assertion(A): | Mutant plants that are not able to carry out cyclic electron flow do not grow well in intense light conditions. |
| Reason(R): | Cyclic electron flow may be photoprotective. |
| 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. |
Heme and iron-sulfur complexes in photosynthesis:
| 1. | act as reducing agents |
| 2. | act as oxidizing agents |
| 3. | both oxidize and reduce during electron transport |
| 4. | are needed only in respiration but not in photosynthesis |