Q. No.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.
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.
The Engelmann experiment shown in the given diagram helped to understand the relationship between:
1. bacteria and the alga used in the experiment.
2. the rate of respiration in aerobic bacteria and wavelengths of light.
3. wavelengths of light and the oxygen released during photosynthesis.
4. rates of oxygen liberation by alga and carbon dioxide liberated by the bacteria.
Identify the incorrectly matched pair:
| 1. | PS I | P700 is reaction center |
| 2. | RuBP | 5 carbon compound |
| 3. | PS II | P680 is reaction center |
| 4. | C3 plants | Kranz anatomy |
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The given diagram shows the scheme of:
1. Cyclic photophosphorylation and Y is NADPH
2. Cyclic photophosphorylation and Y is ATP
3. Non-Cyclic photophosphorylation and Y is NADPH
4. Non-Cyclic photophosphorylation and Y is ATP
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The correct statements about photosynthesis include:
I. the light-dependent reactions can occur only in the light, the light-independent reactions only in the dark
II. photorespiration is more efficient at producing glucose than is photosynthesis
III. the light-dependent reactions produce the energy-rich compounds that are used to run the light-independent reactions
| 1. | I only | 2. | III only |
| 3. | I and III only | 4. | II and III only |
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Study the given diagram where ‘X’ represents the absorption spectrum of chlorophyll a and ‘Y’ represents the action spectrum of photosynthesis. The conclusions that can be drawn include:
I. Chlorophyll a is the main pigment in photosynthesis.
II. Violet-Blue and Red wavelengths are very effective for photosynthesis.
III. Chlorophyll a is the only pigment capable of absorbing light.
| 1. I and II only | 2. I and III only |
| 3. II and III only | 4. I, II and III |
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Identify the incorrect statement regarding the light independent reactions in photosynthesis:
1. These reactions occur in the stroma.
2. They use the products (ATP and NADPH) of light-dependent reactions.
3. They occur in the absence of light and hence are called the dark reactions.
4. The three phases are carbon fixation, reduction reactions, and ribulose 1,5-bisphosphate (RuBP) regeneration.
The number of turns of Calvin cycle required to produce one molecule of Glyceraldehyde 3 Phosphate is:
| 1. | 1 | 2. | 2 |
| 3. | 3 | 4. | 6 |
The number of molecules of NADPH and ATP required respectively to reduce six molecules of carbon dioxide to glucose in Calvin cycle?
| 1. 6 and 6 | 2. 12 and 12 |
| 3. 12 and 18 | 4. 18 and 12 |
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Identify the correct statement regarding the functioning of photosystem II?
1. The reaction center is P700.
2. It works after PS I in non cyclic photophosphorylation.
3. Water splits and carbon dioxide is released.
4. The electron vacancies in P680 are filled by electrons derived from water.
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