- 1(current)
Q. No.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.
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.
It can be correctly said about the relation between the absorption spectra of various pigments and the action spectrum of photosynthesis that:
| 1. | There is a complete one to one overlap between the absorption spectrum of chlorophyll a and the action spectrum of photosynthesis. |
| 2. | There is a complete one to one overlap between the absorption spectrum of chlorophyll b and the action spectrum of photosynthesis. |
| 3. | The absorption spectrum of chlorophyll a is wider than the action spectrum of photosynthesis. |
| 4. | The absorption spectrum of chlorophyll a is narrower than the action spectrum of photosynthesis. |
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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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The absorption spectrum in the given diagram will be of:
| 1. Chlorophyll a | 2. Chlorophyll b |
| 3. Carotenoids | 4. Retinol |
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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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| COLUMN I | COLUMN II | ||
| A | Chlorophyll a | P | Bright or blue-green |
| B | Chlorophyll b | Q | Yellow-green |
| C | Xanthophylls | R | Yellow |
| D | Carotenoids | S | Yellow to yellow-orange |
Codes
| A | B | C | D | |
| 1. | P | Q | R | S |
| 2. | Q | R | S | P |
| 3. | R | S | P | Q |
| 4. | S | P | Q | R |
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I. include Carotenoids and Xanthophylls but not Chlorophyll b.
II. enable a wider range of wavelength of incoming light to be utilised for photosynthesis.
III. protect Chlorophyll a from photo-oxidation.
1. Only I and II are correct
2. Only I and III are correct
3. I, II and III are correct
4. Only II and III are correct
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Q. No.
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