Q. No.Identify the incorrect statement regarding the comparison of plants to the plants:
1. They tolerate higher temperatures
2. They show a response to high light intensities
3. They have a lower productivity of biomass
4. They lack photorespiration
1. They tolerate higher temperatures
2. They show a response to high light intensities
3. They have a lower productivity of biomass
4. They lack photorespiration
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The bundle sheath cells are characterized by:
| I: | a large number of chloroplasts present in them |
| II: | thick cell walls impervious to gas exchange |
| III: | large intercellular spaces |
| 1. Only I and II | 2. Only I and III |
| 3. Only II and III | 4. I, II and III |
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The primary acceptor in plants is:
1. RuBP in mesophyll cells
2. RuBP in bundle sheath cells
3. PEP in mesophyll cells
4. PEP in bundle sheath cells
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The pathway:
1. is common to all plants
2. takes place in mesophyll cells in plants
3. takes place in bundle sheath cells in plants
4. does not take place in CAM plants
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In pathway, the 4-carbon compound transported to bundle sheath cells most commonly is:
| 1. | Glutamic acid | 2. | Malic acid |
| 3. | Oxaloacetic acid | 4. | Fumaric acid |
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The most common enzyme in the world is:
| 1. | PEP carboxylase | 2. | Pyruvate dehydrogenase |
| 3. | RuBisCO | 4. | Collagenase |
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The 2-carbon compound formed in photorespiration is:
| 1. | Acetyl CoA | 2. | Phosphoglycolate |
| 3. | Acetic acid | 4. | Ethanol |
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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. |
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Identify the correctly matched rows:
| C3 | C4 | ||
| I: | Productivity | Low | High |
| II: | CO2 compensation point | Low | Low |
| III: | Temperature optimum | 20 – 250 C | 30 – 450 C |
| 1. | Only I and II | 2. | Only I and III |
| 3. | Only II and III | 4. | I, II and III |
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Except for plants in shade or in dense forests, light is rarely a limiting factor in nature. This is because:
| 1. | Dark reactions do not depend on light |
| 2. | The rate of photosynthesis can be increased by higher carbon dioxide and lower temperatures even in low light conditions |
| 3. | Light saturation occurs at 10 % of full sunlight |
| 4. | Carbon fixation is independent of enzymes |
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