Q. No.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.
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
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