Q. No.Which stage of the Calvin Cycle utilizes ATP?
1. Carboxylation
2. Reduction
3. Regeneration
4. Both 2 and 3
Which of the following are special features of the C4 plants?
| I: | They have a special type of leaf anatomy. |
| II: | They tolerate higher temperatures and show a response to high light intensities. |
| III: | They lack photorespiration and have greater productivity of biomass. |
| 1. | Only I and II |
| 2. | Only I and III |
| 3. | Only II and III |
| 4. | I, II and III |
Identify the statement that is true for C4 plants but not for C3 plants?
| 1. | Initially fix carbon dioxide in mesophyll cells as 4-carbon long compounds. |
| 2. | Initially fix carbon dioxide in bundle sheath cells as 3-carbon long compounds. |
| 3. | Initially fix carbon dioxide in mesophyll cells as 3-carbon long compounds. |
| 4. | Initially fix carbon dioxide in bundle sheath cells as 4-carbon long compounds. |
Crops such as tomatoes and bell pepper, allowed to grow in a carbon dioxide rich environment, show higher yields because:
| 1. | They show an increased rate of photosynthesis at higher carbon dioxide concentrations. |
| 2. | They can respond to high carbon dioxide conditions even in low light conditions. |
| 3. | They show C4 pathway for carbon fixation at high carbon dioxide is the limiting factor in such plants. |
| 4. | Only carbon dioxide is the limiting factor in such plants. |
Consider the following two statements:
| I: | Except for plants in shade or in dense forests, light is rarely a limiting factor in nature for photosynthesis. |
| II: | Light saturation occurs at 50% of the full sunlight. |
| 1. | Both statements are correct and II explains I |
| 2. | Both statements are incorrect |
| 3. | I is correct and II is incorrect |
| 4. | I is incorrect and II is correct |
For assimilation of one CO2 molecule via photosynthesis, the energy required in form of ATP and NADPH2 are:
1. 2 ATP and 2 NADPH2
2. 5 ATP and 3 NADPH2
3. 3 ATP and 2 NADPH2
4. 18 ATP and 12 NADPH2.
In the given diagram, X, Y, and Z respectively represent the absorption spectrum of:
1. Chlorophyll a, Chlorophyll b, and Carotenoids
2. Chlorophyll b, Chlorophyll a, and Carotenoids
3. Chlorophyll b, Carotenoids, and Chlorophyll a
4. Chlorophyll a, Carotenoids, and Chlorophyll b
In the diagrammatic representation of the Hatch and Slack pathway, A and B respectively represent:
| 1. | Mesophyll cells and Bundle sheath cells |
| 2. | Bundle sheath cells and Mesophyll cells |
| 3. | Bundle sheath cells and Palisade cells |
| 4. | Mesophyll cells and Guard cells |
Phosphoenol pyruvate (PEP) is the primary CO2 acceptor in
1. C3 -plants
2. C4 -plants
3. C2 -plants
4. C3 and C4 -plants
With reference to factors affecting the rate of photosynthesis, which of the following statements is not correct?
| 1. | Light saturation for CO2-fixation occurs at 10% of full sunlight. |
| 2. | Increasing atmospheric CO2 concentration upto 0.05% can enhance the CO2-fixation rate |
| 3. | C3 plants respond to higher temperature with enhanced photosynthesis, while C4 plants have a much lower temperature optimum. |
| 4. | Tomato is a greenhouse crop, which can be grown in a CO2-enriched atmosphere for higher yield. |
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