Q. No.In the C4 pathway, which of the following molecules combines with carbon dioxide?
1. glyceraldehyde phosphate
2. ribulose biphosphate
3. phosphoenol pyruvic acid
4. citric acid
An action spectrum of photosynthesis was first described by:
1. Jan Ingenhousz
2. Julius von Sachs
3. T.W. Engelmann
4. Cornelius van Niel
Dark reactions of photosynthesis are actually not totally independent of light as:
(1) The initial reactions occur in the presence of light.
(2) The reaction will be inhibited by the presence of light.
(3) They can occur during the day as well.
(4) They utilize the products of the light reaction.
All the following regarding the role of xanthophylls and carotenoids in photosynthesis are correct except:
| 1. | They act as accessory pigments |
| 2. | Their peak absorption is in blue and red regions of VIBGYOR |
| 3. | They enable a wider range of wavelength of incoming light to be utilized for photosynthesis |
| 4. | They protect chlorophyll a form of photo-oxidation. |
The chloroplast stroma lamella membrane:
1. lacks PS II as well as NADP reductase enzyme.
2. lacks PS II but has NADP reductase enzyme.
3. lacks NADP reductase enzyme but has PS II.
4. has PS II as well as NADP reductase enzyme.
Which stage of the Calvin Cycle utilizes ATP?
1. Carboxylation
2. Reduction
3. Regeneration
4. Both 2 and 3
Which of the following are special features of the C4 plants?
| I: | They have a special type of leaf anatomy. |
| II: | They tolerate higher temperatures and show a response to high light intensities. |
| III: | They lack photorespiration and have greater productivity of biomass. |
1. Only I and II
2. Only I and III
3. Only II and III
4. I, II and III
Identify the statement that is true for C4 plants but not for C3 plants?
1. Initially fix carbon dioxide in mesophyll cells as 4-carbon long compounds.
2. Initially fix carbon dioxide in bundle sheath cells as 3-carbon long compounds.
3. Initially fix carbon dioxide in mesophyll cells as 3-carbon long compounds.
4. Initially fix carbon dioxide in bundle sheath cells as 4-carbon long compounds.
Crops such as tomatoes and bell pepper, allowed to grow in a carbon dioxide rich environment, show higher yields because:
| 1. | They show an increased rate of photosynthesis at higher carbon dioxide concentrations. |
| 2. | They can respond to high carbon dioxide conditions even in low light conditions. |
| 3. | They show C4 pathway for carbon fixation at high carbon dioxide is the limiting factor in such plants. |
| 4. | Only carbon dioxide is the limiting factor in such plants. |
Consider the following two statements:
| I: | Except for plants in shade or in dense forests, light is rarely a limiting factor in nature for photosynthesis. |
| II: | Light saturation occurs at 50% of the full sunlight. |
1. Both statements are correct and II explains I
2. Both statements are incorrect
3. I is correct and II is incorrect
4. I is incorrect and II is correct
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