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Q. No.‘The effect of water as a factor affecting photosynthesis is more through its effect on the plant, rather than directly on photosynthesis’. Which of the following support this statement?
I:
Water stress causes the stomata to close, hence reducing the CO2 availability.
II:
Water stress also makes leaves wilt, thus, increasing the surface area of the leaves and their metabolic activity as well.
1. Only I
2. Only II
3. Both I and II
4. Neither I nor II
Subtopic: Factors Affecting Photosynthesis |
70%
From NCERT
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Consider the given two statements:
| Assertion (A): | Plants that do not use PEP-carboxylase in primary carbon fixation are called C3 plants. |
| Reason (R): | C3 plants are so called because, the primary carboxylation reaction, catalyzed by RuBisCO, produces the three-carbon 3-phosphoglyceric acids directly in the Calvin-Benson cycle. |
| 1. | (A) is True but (R) is False |
| 2. | Both (A) and (R) are True and (R) explains (A) |
| 3. | Both (A) and (R) are True but (R) does not explain (A) |
| 4. | (A) is False but (R) is True |
Subtopic: Dark Reaction : Calvin Cycle | C4 Cycle (Hatch & Slack Pathway) |
50%
From NCERT
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Consider the given two statements:
| Assertion (A): | Water molecules appear on both sides of the equation of photosynthesis. |
| Reason (R): | The molecules that enter the reaction are not the same molecules that emerge from the reaction. |
| 1. | Both (A) and (R) are True and (R) correctly explains (A). |
| 2. | Both (A) and (R) are True but (R) does not correctly explain (A). |
| 3. | (A) is True but (R) is False. |
| 4. | Both (A) and (R) are False |
Subtopic: Light Reaction: Photophosphorylation | Light Reactions :1 | Light Reactions :2 | Light Reactions :3 |
From NCERT
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In non-cyclic photophosphorylation, the ultimate acceptor of electrons is:
| 1. | Oxygen | 2. | NADP+ |
| 3. | Water | 4. | G3P |
Subtopic: Photosynthetic Pigments | Light Reaction: Photophosphorylation | Light Reactions :1 | Light Reactions :2 | Light Reactions :3 |
80%
From NCERT
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Who provided evidence for production of glucose when plants grow and that the glucose is usually stored as starch in plants?
1. Arnon and his team
2. F. F. Blackmann
3. Julius von Sachs
4. Jan Ingenhousz
1. Arnon and his team
2. F. F. Blackmann
3. Julius von Sachs
4. Jan Ingenhousz
Subtopic: Historical View: Experiments |
93%
From NCERT
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On chromatogram, which of the following photosynthetic pigments appears yellow to yellow-orange?
| 1. | Chlorophyll a | 2. | Chlorophyll b |
| 3. | Xanthophylls | 4. | Carotenoids |
Subtopic: Photosynthetic Pigments |
77%
From NCERT
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Consider the given two statements:
| Assertion (A): | Accessory photosynthetic pigments in higher plants enable a wider range of wavelength of incoming light to be utilised for photosynthesis. |
| Reason (R): | Accessory pigments protect chlorophyll a from photo-oxidation. |
| 1. | Both (A) and (R) are True and (R) correctly explains (A). |
| 2. | Both (A) and (R) are True but (R) does not correctly explain (A). |
| 3. | (A) is True but (R) is False. |
| 4. | Both (A) and (R) are False. |
Subtopic: Photosynthetic Pigments |
71%
From NCERT
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Consider the two statements:
| Statement I: | The electrons that are removed from photosystem II are replaced by electrons available due to splitting of water. |
| Statement II: | The electrons needed to replace those removed from photosystem I are provided by photosystem II. |
| 1. | Statement I is correct; Statement II is incorrect |
| 2. | Statement I is correct; Statement II is correct |
| 3. | Statement I is incorrect; Statement II is incorrect |
| 4. | Statement I is incorrect; Statement II is correct |
Subtopic: Chemiosmotic hypothesis |
88%
From NCERT
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Identify the incorrect statement:
| 1. | When only PS I is functional, the electron is circulated within the photosystem and the phosphorylation occurs due to cyclic flow of electrons. |
| 2. | A possible location of cyclic flow of electrons is in the stroma lamellae. |
| 3. | The stroma lamellae membranes have both PS II as well as NADP reductase enzyme. |
| 4. | When only PS I is functional, the electron is circulated within the photosystem and the phosphorylation occurs due to cyclic flow of electrons. |
Subtopic: Light Reaction: Electron Transport | Light Reaction: Photophosphorylation | Light Reactions :1 | Light Reactions :2 | Light Reactions :3 |
92%
From NCERT
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Consider the given two statements:
| Assertion (A): | Electron transport via cytochrome b6f is responsible for creating the proton gradient that drives the synthesis of ATP in chloroplasts. |
| Reason (R): | Cytochrome b6f complex functions to mediate the transfer of electrons and of energy between Photosystem II and Photosystem I, while transferring protons from the chloroplast stroma across the thylakoid membrane into the lumen. |
| 1. | Both (A) and (R) are True and (R) correctly explains (A). |
| 2. | Both (A) and (R) are True but (R) does not correctly explain (A). |
| 3. | (A) is True but (R) is False. |
| 4. | Both (A) and (R) are False. |
Subtopic: Chemiosmotic hypothesis |
71%
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