Assertion:
Ethylene can either act as a growth promoter or inhibitor
Reason:
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.
If both assertion and reason are true and the reason is the correct explanation of the assertion
2.
If both assertion and reason are true but the reason is not the correct explanation of the assertion
3.
If assertion is true but reason is false
4.
If both assertion and reason 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 reason 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: | 2, 4-D is artificial auxin. |
| Reason: | 2, 4-D is a weedicide and quickly kills mature monocots. |
| 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 the reason is false. |
| 4. | Both assertion and reason are false statements. |
Subtopic: Â Auxin Function |
 79%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
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To view explanation, please take trial in the course.
NEET 2025 - Target Batch
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 |
 65%
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Methods to break seed dormancy involves:
1. Stratification
2. Scarification
3. Light exposure
4. More than one option is involved
1. Stratification
2. Scarification
3. Light exposure
4. More than one option is involved
 77%
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External stimuli would be received most quickly by a plant cell if the receptors for signal transduction were located in the
1. plasma membrane
2. cytoplasmic matrix.
3. endoplasmic reticulum
4. nuclear membrane
1. plasma membrane
2. cytoplasmic matrix.
3. endoplasmic reticulum
4. nuclear membrane
Subtopic: Â Growth Terminology |Â Development |
 67%
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