Q. No.The oxygenation activity of RuBisCo enzyme in photorespiration leads to the formation of:
1.
1 molecule of the 3-C compound
2.
1 molecule of the 6-C compound
3.
1 molecule of a 4-C compound and 1 molecule of the 2-C compound
4.
2 molecules of the 3-C compound
Emerson's enhancement effect and Red drop have been instrumental in the discovery of
1. two photosystems operating simultaneously
2. photophosphorylation and cyclic electron transport
3. oxidative phosphorylation
4. photophosphorylation and non-cyclic electron transport
Which of the following statements is incorrect?
| 1. | RuBisCO is a bifunctional enzyme |
| 2. | In C4 plants, the site of RuBisCO activity is mesophyll cell |
| 3. | The substrate molecule for RuBisCO activity is a 5-carbon compound |
| 4. | RuBisCO action requires ATP and NADPH |
In light reaction, plastoquinone facilitates the transfer of electrons from:
| 1. | Cytb6f complex to PS I | 2. | PS I to NADP+ |
| 3. | PS I to ATP synthase | 4. | PS II to Cytb6f complex |
If the given pyrrole ring is of chlorophyll a molecule, X should be:
1. -CHO
2. -CH3
3. -CH2OH
4. -CH3COOH
Consider the two statements:
| I. | The current availability of carbon dioxide in the atmosphere is limiting for C3 plants. |
| II. | C3 plants attain saturation at much higher carbon dioxide concentration than that present in the current atmosphere. |
| 1. | Both I and II are correct and II explains I |
| 2. | Both I and II are correct but II does not explain I |
| 3. | I is correct but II is incorrect |
| 4. | Both I and II are correct |
Consider the given statements:
| I. | In C4 plants light reactions occur in mesophyll cells whereas the carbon dioxide assimilation is carried out in bundle sheath cells |
| II. | In CAM plants, the events are separated in time but occur in the same type of cells. |
| 1. | Only I is correct |
| 2. | Only II is correct |
| 3. | Both I and II are correct |
| 4. | Both I and II are incorrect |
The correct sequential involvement of organelles in the photorespiratory pathway is:
| 1. | Chloroplast → Peroxisome → Mitochondria |
| 2. | Chloroplast → Mitochondria → Peroxisome |
| 3. | Mitochondria → Chloroplast → Peroxisome |
| 4. | Mitochondria → Peroxisome → Chloroplast |
The correct sequence of flow of electron during light dependent reactions in plants is:
| 1. | P680 → P700 → water → NADP+ |
| 2. | water → P700 → NADP+→ P680 |
| 3. | P700 → P680 → NADP+→ water |
| 4. | water → P680 → P700 → NADP+ |
© 2025 GoodEd Technologies Pvt. Ltd.