Q. No.Phosphoenol pyruvate (PEP) is the primary CO2 acceptor in
(1) C3 -plants
(2) C4 -plants
(3) C2 -plants
(4) C3 and C4 -plants
At about what percentage of the full sunlight does light saturation occurs in photosynthesis?
1. 10
2. 25
3. 70
4. 95
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 |
Which stage of the Calvin Cycle utilizes ATP?
1. Carboxylation
2. Reduction
3. Regeneration
4. Both 2 and 3
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.
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. |
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. |
Consider the situation where photosynthesis is going on at a steady pace in a typical experiment with a light on, and carbon dioxide is being combined with ribulose-bisphosphate (RuBP) to produce 3-phosphoglycerate (3PG). Then suddenly the source of carbon dioxide is eliminated. What changes in the concentrations of 3PG and RuBP would occur?
| 1. | 3PG levels rise, RuBP levels fall. |
| 2. | 3PG levels fall, RuBP levels rise. |
| 3. | 3PG levels rise, RuBP levels rise. |
| 4. | 3PG levels fall, RuBP levels fall. |
Compared to retinal, chlorophyll can be described as a pigment that has a
| 1. | narrow absorption range but high efficiency |
| 2. | narrow apsorption range but low efficiency |
| 3. | wide absorption range but high effeciency |
| 4. | wide absorption range but low efficiency |
Suppose the interoir of the thylakoids of isolated chloroplasts and then transferred in the dark to a pH 8 solution. What would be likely to happen?
| 1. | The isolated chloroplasts will make ATP |
| 2. | The Clavin cycle will be activated. |
| 3. | The cyclic photophosphorylation will occur |
| 4. | Isolated chloroplasts will generate oxygen gas |
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