Assertion:
The efficiency of C4 - plants is more than those of C3 - plants
Reason:
C4 - plants are more efficient in picking \(CO_2\)
1.
Both assertion and reason are true and the reason is the correct explanation of the assertion
2.
Both assertion and reason are true but the reason is not the correct explanation of the assertion
3.
Assertion is true but reason is false
4.
Both assertion and reason are false
Subtopic: C4 Cycle (Hatch & Slack Pathway) | Photorespiration |
72%
From NCERT
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| Assertion(A): | Cyclic pathway of photosynthesis first appeared in some eubacterial species |
| Reason(R): | Oxygen started accumulating in the atmosphere after the non-cyclic pathway of photosynthesis evolved |
| 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 |
58%
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Following crops have been extensively cultivated in CO2 rich atmosphere for higher yield:
| 1. | Sugar beet and Cabbage | 2. | Carrots and Tomatoes |
| 3. | Wheat and Sugar beet | 4. | Tomatoes and Bell pepper |
Subtopic: Factors Affecting Photosynthesis |
84%
From NCERT
NEET - 2022
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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%
From NCERT
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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 |
55%
From NCERT
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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%
From NCERT
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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%
From NCERT
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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 |
91%
From NCERT
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| Assertion(A): | As a plant photosynthesises, many factors will simultaneously affect its rate. |
| Reason(R): | Usually one factor is the major cause or is the one that limits the rate. |
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: Factors Affecting Photosynthesis |
64%
From NCERT
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| Assertion(A): | When several factors affect any [bio] chemical process, Blackman’s (1905) Law of Limiting Factors comes into effect. |
| Reason(R): | At any point of photosynthesis, the rate will be determined by the factor available at sub-optimal levels. |
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: Factors Affecting Photosynthesis |
From NCERT
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