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
If the given pyrrole ring is of chlorophyll a molecule, X should be:
1. -CHO
2. -CH3
3. -CH2OH
4. -CH3COOH
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 |
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
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+ |
Photorespiration is avoided by C4 plants primarily because:
| 1. | They do not participate in the Calvin cycle. |
| 2. | They use PEP carboxylase to initially fix CO2. |
| 3. | They conserve water more efficiently. |
| 4. | They are adapted to cold, wet climates. |
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