At about what percentage of the full sunlight does light saturation occurs in photosynthesis?
1. 10
2. 25
3. 70
4. 95
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 |
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 |
Water vapour comes out from the plant leaf through the stomatal opening. Through the same stomatal opening carbon dioxide diffuses into the plant during photosynthesis. Reason out the above statements using the following options.
| 1. | Both process can happen together because the diffusion coefficient of water and CO2 is different. |
| 2. | The above processes happen only during night time |
| 3. | One process occurs during the day time and the other night |
| 4. | Both processes cannot happen simultaneously |
PEP is present in which cells?
1. Only Mesophyll cells
2. Bundle Sheath cells
3. both a and b
4. Passage cells
At any point, the rate of photosynthesis is determined by the factor which is available at---------- levels.
| 1. | optimal | 2. | higher than required |
| 3. | sub-optimal | 4. | won’t depend |
Who gave the law of limiting factors and when?
| 1. | Lieman-1906 | 2. | Blackman-1905 |
| 3. | Lieman-1905 | 4. | Blackman-1906 |
What kind of graph one will obtain if he observes CO2 fixation rates at low intensities?
| 1. | Parabola | 2. | Linear |
| 3. | Circular | 4. | Hyperbola |
Light is a limiting factor for plants in shade-
| 1. | as they do not get full sunlight |
| 2. | as they do not get at most 10 % of full sunlight |
| 3. | as they do not get at least 50 % of full sunlight |
| 4. | as they do not get at most 70% full sunlight |
What is the major limiting factor for photosynthesis?
1. CO2
2. Water
3. Sunlight
4. Chlorophyll
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