Assertion(A):
ABA is also called stress hormone
Reason(R):
ABA increases the tolerance of plants to various kinds of stresses
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 statements
Subtopic: Â Abscisic Acid |
 93%
From NCERT
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| Assertion (A): | Development is the sum total of growth and differentiation. |
| Reason (R): | Development is controlled by extrinsic factors as well as intrinsic factors. |
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. | Both (A) and (R) are false. |
Subtopic: Â Development |
 72%
From NCERT
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| Assertion(A): | Ethylene can either act as a growth promoter or inhibitor |
| Reason(R): | Ethylene helps in breaking the dormancy of seeds and buds and is also responsible for the senescence of plant parts like leaves and flower |
| 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 statements |
Subtopic: Â Ethylene |
 74%
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| Assertion (A): | GA3 can be used to speed up the malting process in brewing industry. |
| Reason (R): | Gibberellin is synthesised only by some fungi. |
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. | Both (A) and (R) are false. |
Subtopic: Â Gibberellin |
 64%
From NCERT
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| Assertion (A): | Auxins are effective to prevent early drop of fruits and leaves |
| Reason (R): | Auxins promote abscission of younger leaves and fruits |
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A) |
| 2. | Both (A) assertion 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 statements |
Subtopic: Â Auxin Function |
 75%
From NCERT
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| Assertion(A): | 2, 4-D is artificial auxin. |
| Reason(R): | 2, 4-D is a weedicide and quickly kills mature monocots. |
| 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 the (R) is false. |
| 4. | Both (A) and (R) are false statements. |
Subtopic: Â Auxin Function |
 79%
From NCERT
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NEET 2026 - Target Batch - Vital
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Which of the following is incorrect?
| 1. | IAA is synthesised from tryptophan |
| 2. | Auxin regulates vascular differentiation |
| 3. | Gibberellin transport is polar |
| 4. | Roughly equal amounts of auxin and cytokinin causes continued proliferation of undifferentiated callus |
Subtopic: Â Gibberellin |
 58%
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Physiologically active form of phytochrome is:
1. \(P_{730} / P_{fr}\)
2. \(P_{660} / P_{r}\)
3. \(P_{700} \)
4. \(P_{680} \)
1. \(P_{730} / P_{fr}\)
2. \(P_{660} / P_{r}\)
3. \(P_{700} \)
4. \(P_{680} \)
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Which is not caused by the deficiency of mineral nutrition?
1. Chlorosis
2. Internode
3. Necrosis
4. Etiolation
1. Chlorosis
2. Internode
3. Necrosis
4. Etiolation
 59%
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Lodging or falling of many crop plants during windy seasons can be prevented by the application of :
1. NAA
2. GA
3. ABA
4. Ethylene
1. NAA
2. GA
3. ABA
4. Ethylene
Subtopic: Â Auxin Function |
 66%
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