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Q. No.
Given below are two statements:
Assertion (A):
Proton gradient is important during photosynthesis.
Reason (R):
Breakdown of proton gradient leads to release of energy.
1.
Both (A) and (R) are true and (R) is the correct explanation of (A).
2.
Both (A) and (R) are true but (R) is not the correct explanation of (A).
3.
(A) is true but (R) is false.
4.
Both (A) and (R) are false.
Subtopic: Chemiosmotic hypothesis |
89%
From NCERT
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Given below are two statements:
| Assertion (A): | Biosynthetic pathway is also called as Calvin cycle. |
| Reason (R): | Melvin Calvin contributed to working out the complete biosynthetic pathway. |
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | Both (A) and (R) are false. |
Subtopic: WHERE ARE THE ATP AND NADPH USED |
76%
From NCERT
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Given below are two statements:
| Assertion (A): | Enzyme RuBisCO is called as RuBP Carboxylase oxygenase. |
| Reason (R): | RubisCo has both oxygenation and carboxylation activity. |
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | Both (A) and (R) are false. |
Subtopic: Dark Reaction : Calvin Cycle |
91%
From NCERT
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Given below are two statements:
| Assertion (A): | CO2 fixation is decreased in C3 plants. |
| Reason (R): | In C3 plants, some O2 bind to RuBisCo |
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | Both (A) and (R) are false. |
Subtopic: Photorespiration |
86%
From NCERT
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Given below are two statements:
| Assertion (A): | At any point, the rate of photosynthesis will be determined by the factor available at sub-optimal levels. |
| Reason (R): | During photosynthesis, usually one factor affecting CO2 fixation is the major cause that limits its rate. |
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | Both (A) and (R) are false. |
Subtopic: Factors Affecting Photosynthesis |
57%
From NCERT
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Given below are two statements:
| Assertion (A): | Light is rarely a limiting factor for plants except for plants in shade. |
| Reason (R): | For photosynthesis, light saturation occurs at 10 percent of full sunlight. |
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | Both (A) and (R) are false. |
Subtopic: Factors Affecting Photosynthesis |
81%
From NCERT
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Given below are two statements:
| Assertion (A): | Water stress can reduce the CO2 availability. |
| Reason (R): | Water stress caused the stomata to close. |
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | Both (A) and (R) are false. |
Subtopic: Factors Affecting Photosynthesis |
77%
From NCERT
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Given below are two statements:
| Assertion (A): | Cyano-bacterial photosynthesis is mostly oxygenic. |
| Reason (R): | NADPH2, ATP and water are used during photosynthesis. |
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | Both (A) and (R) are false. |
Subtopic: Light Reaction: Electron Transport | Dark Reaction: Biosynthetic Phase |
From NCERT
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Given below are two statements:
| Assertion (A): | In green plants, H2O is hydrogen donor and oxidised to O2. |
| Reason (R): | Splitting of water molecules take place on the outer side of the thylakoid membrane. |
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | Both (A) and (R) are false. |
Subtopic: Historical View: Experiments | Chemiosmotic hypothesis |
69%
From NCERT
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Given below are two statements:
| Assertion (A): | Carboxylation is the most crucial step of Calvin cycle. |
| Reason (R): | This reaction is catalysed by the enzyme RuBP carboxylase which results in the formation of two molecules of 3-PGA |
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | Both (A) and (R) are false. |
Subtopic: Dark Reaction : Calvin Cycle |
63%
From NCERT
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