Q. No.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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The correct sequence of flow of electrons in the light reaction is
| 1. | PSII, plastoquinone, cytochromes, PS I, ferredoxin |
| 2. | PSI, plastoquinone, cytochromes, PS II, ferredoxin |
| 3. | PSI, ferredoxin, PS II, |
| 4. | PSI, plastoquinone, cytochromes, PS II, ferredoxin |
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The reactions of the Calvin cycle can take place as long as which of the following products of the light dependent reactions are available?
| 1. | Water and Glucose | 2. | Water and ATP |
| 3. | Oxygen and Carbon dioxide | 4. | ATP and NADPH |
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The factors that can be limiting for the light independent reactions of photosynthesis are:
1. , temperature, and light
2. , light, and water
3. water, temperature, and
4. oxygen, water, and temperature
The absorption spectrum in the given diagram will be of:
| 1. | Chlorophyll a | 2. | Chlorophyll b |
| 3. | Carotenoids | 4. | Retinol |
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The wavelengths of light most useful in photosynthesis are:
| 1. | green and orange | 2. | red and blue |
| 3. | infrared and yellow | 4. | red and green |
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Oxygen, during oxygenic photosynthesis, is produced during:
1. cyclic photophosphorylation
2. the light-dependent reactions involving photosystems I and II
3. Calvin cycle
4. the Krebs cycle
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In oxygenic photosynthesis, the release of oxygen is a byproduct of:
1. chemiosmosis
2. reducing by FNR
3. splitting the water molecules
4. cyclic photophosphorylation
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The greatest problem with photorespiration is faced by:
| 1. | C4 plants | 2. | C3 plants |
| 3. | CAM plants | 4. | purple sulfur bacteria |
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The diagram shows the famous Engelmann experiment that helped us understand important aspects of the process of photosynthesis. What conclusion can be drawn by the pattern of accumulation of aerobic bacteria shown in the diagram?
| 1. | Excess carbon dioxide is released by the alga in the area of accumulation. |
| 2. | Only red and violet lights are effective for photosynthesis. |
| 3. | In the areas of accumulation, most oxygen was liberated by the alga. |
| 4. | Bacteria are attracted to red and blue light. |
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