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Q. No.Given below are two statements:
Assertion (A):
It was inferred from the experiments performed on green & purple sulphur bacteria that the O2 evolved by green plants comes from H2O.
Reason (R):
Purple and green sulphur bacteria release sulphur or sulphate as oxidation product 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: Historical View: Experiments |
59%
From NCERT
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Given below are two statements:
| Assertion (A): | Synthesis of ATP and NADPH during photophosphorylation is referred as light reaction. |
| Reason (R): | In plants, ATP and NADPH synthesis is directly driven by light. |
| 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: Photophosphorylation |
From NCERT
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Given below are two statements:
| Assertion (A): | In PS I, the reaction centre chlorophyll 'a' has an absorption peak at 700 nm. |
| Reason (R): | PS II reaction centre is called P 680. |
| 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: Photosystems |
82%
From NCERT
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Given below are two statements:
| Assertion (A): | The protons produced by splitting of H2O get accumulated within the lumen of the thylakoids. |
| Reason (R): | Splitting of water takes place on the inner 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: Chemiosmotic hypothesis |
83%
From NCERT
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Given below are two statements:
| Assertion (A): | Protons are transported across the thylakoid membrane when electrons move through the photosystems. |
| Reason (R): | The primary acceptor of electron, located towards the outer side of thylakoid membrane & transfers its electrons to an H carrier. |
| 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 |
64%
From NCERT
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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 |
88%
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 |
75%
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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