Q. No.Which of the following statements is incorrect?
1. RuBisCO is a bifunctional enzyme
2. In C4 plants, the site of RuBisCO activity is mesophyll cell
3. The substrate molecule for RuBisCO activity is a 5-carbon compound
4. RuBisCO action requires ATP and NADPH
1. RuBisCO is a bifunctional enzyme
2. In C4 plants, the site of RuBisCO activity is mesophyll cell
3. The substrate molecule for RuBisCO activity is a 5-carbon compound
4. RuBisCO action requires ATP and NADPH
What would be true for cyclic photophosphorylation in photosynthetic plants?
1. It utilizes excess ATP.
2. It reduces NADP+ to NADPH.
3. It occurs in the cytochrome of the complex and utilizes electrons from photosystem I.
4. It utilizes electrons from photosystem II.
Consider the two statements:
I. Elevated atmospheric CO2 increases the instantaneous rate of photosynthesis in C3 plants.
II. Current availability of atmospheric CO2 level is limiting to the C3 plants.
1. Both I and II are correct and II explains I
2. Both I and II are correct but II does not explain I
3. I is correct but II is incorrect
4. Both I and II are incorrect
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Consider the two statements:
I. The C4 photosynthesis pathway uses more energy than the C3 photosynthesis pathway.
II. C4 plants are able to more efficiently fix carbon in drought, high temperatures, and in limitations of nitrogen or CO2.
1. Both I and II are correct and II explains I
2. Both I and II are correct but II does not explain I
3. Only I is correct
4. Both I and II are incorrect
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The first stable product of CO2 fixation in sorghum is:
| 1. | Succinic acid | 2. | Phosphoglyceric acid |
| 3. | Pyruvic acid | 4. | Oxaloacetic acid |
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Identify the incorrect comparison between C3 and C4 photosynthetic plants:
| Characteristic | C3 plants | C4 plants | |
| 1. | Chloroplasts | One type [only granal] | Two types [granal and agranal] |
| 2. | Photorespiration | High | Negligible |
| 3. | First CO2 fixation product | 3-PGA | OAA |
| 4. | Carboxylase enzyme | Only RuBisCO | Only PEPcase |
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Match the scientists given in Column I with their contribution in understanding the process of photosynthesis in Column II and select the correct answer from the codes given below:
| COLUMN I | COLUMN II | ||
| (A) | Jan Ingenhousz | (a) | Only green parts of the plant are capable of photosynthesis |
| (B) | F. F. Blackman | (b) | Enzymes must carry out light independent reaction |
| (C) | C. B. van Neil | (c) | Oxygen comes from water and not from carbon dioxide |
| (D) | T. W. Engelmann | (d) | First action spectrum of photosynthesis |
Codes
| (A) | (B) | (C) | (D) | |
| 1. | (a) | (b) | (c) | (d) |
| 2. | (b) | (a) | (d) | (c) |
| 3. | (a) | (b) | (d) | (c) |
| 4. | (b) | (a) | (c) | (d) |
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Though chlorophyll a is the major pigment responsible for trapping light, other thylakoid pigments called accessory pigments are also involved. The accessory pigments:
I. Include xanthophylls and carotenoids but not chlorophyll b
II. Absorb light and transfer electrons to chlorophyll a
III. Enable a wider range of wavelength of incoming light to be reflected by green leaves
IV. Make Chlorophyll a more prone to photo-oxidation
The incorrect statements include:
| 1. | Only I and II | 2. | Only III and IV |
| 3. | Only I, III and IV | 4. | I, II, III and IV |
Immediately after light becomes unavailable, the biosynthetic phase of photosynthesis continues for some time and then stops. If then, light is made available, the synthesis starts again. A logical conclusion of these observations will include:
| I: | Biosynthetic phase does not directly depend on the presence of light. |
| II: | Biosynthetic phase depends on the products of light reactions. |
| III: | Biosynthesis phase occurs only in the dark or in the absence of light. |
| 1. | Only I and II | 2. | Only III |
| 3. | Only II | 4. | I, II and III |
Current availability of carbon dioxide is limiting to C3 plants . This means that:
1. At low light intensity, C3 plants respond to high CO2 concentrations
2. Growing plants like tomatoes in carbon dioxide-rich environment is unlikely to increase yield
3. They show saturation in the rates of photosynthesis at carbon dioxide concentration higher than the current level
4. They have better water use efficiency and thus, adapted to warm tropical climates
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