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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plants are able to photosynthesize with no apparent photorespiration because of:
1. absence of Calvin cycle.
2. use of PEP carboxylase for primary carbon dioxide fixation.
3. absence of RuBisCO.
4. presence of tissues that do not require oxygen.
Radioactive carbon [] was fed to a plant during the day and after a short time was traced to oxaloacetate. The plant used in the experiment will be:
| 1. C4 plant | 2. C3 plant |
| 3. CAM plant | 4. carnivorous plant |
Identify the correct statement:
1. The pH within the thylakoid is less than that of the stroma.
2. The pH of the stroma is higher than that of the other two measurements.
3. The pH of the stroma is higher than that of the thylakoid space but lower than that of
the cytosol.
4. The pH of the thylakoid space is higher than that observed anywhere else in the cell.
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