Q. No.| 1. | Chlorophyll a is the chief pigment associated with photosynthesis. |
| 2. | Splitting of water is associated with PS II |
| 3. | Cyclic flow of electrons results only in the synthesis of NADH |
| 4. | Biosynthetic phase is dependent on the products of the light reaction |
In sugarcane plant, is fixed in malic acid in which the enzyme that fixes is
1. Ribulose biphosphate carboxylase
2. Phosphoenol pyruvic acid carboxylase
3. Ribulose phosphate kinase
4. Fructose phosphatase
Identify the correct statement:
| 1. | The pH within the thylakoid is less than that of the stroma. |
| 2. | The pH of the stroma is higher than that of the other two measurements. |
| 3. | The pH of the stroma is higher than that of the thylakoid space but lower than that of the cytosol. |
| 4. | The pH of the thylakoid space is higher than that observed anywhere else in the cell. |
Identify the incorrect statement regarding the enzyme PEP carboxylase:
| 1. | PEP carboxylase has a lower Km for bicarbonate ions, hence, higher affinity — than RuBisCO. |
| 2. | O2 is a very poor substrate for this enzyme. |
| 3. | It plays an important role in C4 cycle but not in CAM plants. |
| 4. | PEP carboxylase is also significant in non-photosynthetic metabolic pathways. |
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The first stable product of CO2 fixation in sorghum is:
| 1. | Succinic acid | 2. | Phosphoglyceric acid |
| 3. | Pyruvic acid | 4. | Oxaloacetic acid |
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A plant in your garden avoids photorespiratory losses, has improved water use efficiency, shows high rates of photosynthesis at high temperatures and has improved efficiency of nitrogen utilization. In which of the following physiological groups would you assign this plant?
| 1. C4 | 2. CAM |
| 3. Nitrogen–fixer | 4. C3 |
Current availability of carbon dioxide is limiting to C3 plants . This means that:
| 1. | At low light intensity, C3 plants respond to high CO2 concentrations |
| 2. | Growing plants like tomatoes in carbon dioxide-rich environment is unlikely to increase yield |
| 3. | They show saturation in the rates of photosynthesis at carbon dioxide concentration higher than the current level |
| 4. | They have better water use efficiency and thus, adapted to warm tropical climates |
| Feature | C3 Plant | C4 Plant | |
| 1. | Cell type in which Calvin cycle takes place | Mesophyll cells | Bundle sheath cells |
| 2. | Cell type in which the initial carboxylation reaction occurs | Bundle sheath cells | Mesophyll cells |
| 3. | Primary carbon dioxide acceptor | RuBP | PEP |
| 4. | Number of carbons in the primary carbon dioxide fixation product | 5 | 3 |
Consider the given two statements:
| I: | The oxygenation reaction of RuBisCO is a wasteful process. |
| II: | 3-phosphoglycerate is not created. |
| 1. | Both I and II are correct and II explains I |
| 2. | I is correct but II is incorrect |
| 3. | Both I and II are correct but II does not explain I |
| 4. | I is incorrect but II is correct |
What can occur during both photosynthesis and respiration?
I: The reduction of oxygen that forms water.
II: Formation of ATP by chemiosmosis
| 1. | Only I | 2. | Only II |
| 3. | Both I and II | 4. | None |
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