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Q. No.Consider the two statements:
Assertion (A):
Except for plants in shade or in dense forests, light is rarely a limiting factor for photosynthesis in nature.
Reason (R):
Increase in incident light beyond a point causes the breakdown of chlorophyll and a decrease in photosynthesis.
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: Factors Affecting Photosynthesis |
72%
From NCERT
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Consider the two statements:
| Assertion (A): | Current availability of CO2 levels is limiting to the C3 plants. |
| Reason (R): | Carbon dioxide is the major limiting factor for photosynthesis. |
| 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: Factors Affecting Photosynthesis |
54%
From NCERT
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‘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%
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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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