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Q. No.Given below are two statements:
Assertion (A):
For evolution of O2 in photosynthesis, PS-II is required.
Reason (R):
PS II is reduced by pulling electrons from water due to which photolysis of H2O occurs.
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 | Light Reactions :1 |
81%
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Given below are two statements
In light of the above statements, choose the most appropriate answer from the options given below
| Statement I: | In photosynthesis, the membrane system is responsible for the synthesis of ATP and NADH in carbon reaction |
| Statement II: | In photosynthesis, enzymatic reactions synthesize sugar and which in turn form starch. These reactions are driven by light |
| 1. | Both Statement I and Statement II are correct |
| 2. | Both Statement I and Statement II are incorrect |
| 3. | Statement I is correct but Statement II is incorrect |
| 4. | Statement I is incorrect but Statement II is correct |
Subtopic: Light Reaction: Electron Transport |
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| Assertion(A): | Peroxisomes participate in photorespiration in C4 plants. |
| Reason(R): | Catalase enzyme is present in high concentration in peroxisomes |
In the following questions a statement of assertion (A) is followed by a statement of reason (R).
| 1. | Both (A) & (R) are true and (R) is the correct explanation of (A) |
| 2. | Both (A) & (R) are true but (R) is not the correct explanation of (A) |
| 3. | (A) is true statement but (R) is false |
| 4. | Both (A) and (R) are false statements |
Subtopic: Questions on Photorespiration |
58%
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Given below are two statements:
| Assertion (A): | Six molecules of CO2 and twelve molecules of NADPH + H+ and 18 ATP are used to form one hexose molecules. |
| Reason (R): | Light reaction results in formation of ATP and NADPH2. |
| 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. |
- If both the assertion and the reason are true and the reason is a correct explanation of the assertion
- If both the assertion and reason are true but the reason is not a correct explanation of the assertion
- If the assertion is true but the reason is false
- If both the assertion and reason are false
Subtopic: Dark Reaction: Biosynthetic Phase | Dark Reaction : Calvin Cycle |
79%
From NCERT
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Given below are two statements:
| Assertion (A): | During Calvin cycle, regeneration of RuBP is crucial for uninterrupted cycle. |
| Reason (R): | RuBP in Calvin cycle acts as a CO2 acceptor. |
| 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 |
77%
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| Assertion(A): | Immediately after light becomes unavailable, the biosynthetic process continues for some time, and then stops. |
| Reason(R): | It is misnomer to call a biosynthetic phase a dark reaction. |
Choices for Assertions and reasons:
| 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. | (A) is false, but (R) is true. |
Subtopic: Dark Reaction: Biosynthetic Phase |
62%
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| Assertion(A): | Melvin Calvin contributed to working out the complete biosynthetic pathway of photosynthesis. |
| Reason(R): | He used radioactive 14C in bacterial photosynthesis. |
Choices for Assertions and reasons:
| 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. | (A) is false but (R) is true. |
Subtopic: Dark Reaction: Biosynthetic Phase |
54%
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| Assertion(A): | RuBisCO has affinity for both the gases: CO2 and O2. |
| Reason(R): | RuBisCO is the most abundant enzyme in the biosphere. |
Choices for Assertions and reasons:
| 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. | (A) is false, but (R) is true. |
Subtopic: Light Reaction: Photophosphorylation |
81%
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| Assertion(A): | C3 plants show a pathway called photorespiration. |
| Reason(R): | RuBisCO binds with oxygen under specific conditions in C3 plants. |
Choices for Assertions and reasons:
| 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. | (A) is false, but (R) is true. |
Subtopic: Photorespiration |
77%
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| Assertion(A): | In C4 plants, photorespiration does not occur. |
| Reason(R): | They have a mechanism that increases the concentration of CO2 at the enzyme site. |
Choices for Assertions and reasons:
| 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. | (A) is false, but (R) is true. |
Subtopic: Question on C4 Pathway |
92%
From NCERT
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