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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NEET 2026 - Target Batch - Vital
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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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
 76%
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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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A:
In some plants flowering is either quantitatively or qualitatively dependent on
exposure to low temperature.
R: Low temperature treatment shortens vegetative phase in some plants
In the following questions a statement of assertion (A) is followed by a statement of reason (R).
1. If both Assertion & Reason are true and the reason is the correct explanation of the assertion, then mark (1)
2. If both Assertion & Reason are true but the reason is not the correct explanation of the assertion, then mark (2)
3. If Assertion is true statement but Reason is false, then mark (3)
4. If both Assertion and Reason are false statements, then mark (4)
R: Low temperature treatment shortens vegetative phase in some plants
In the following questions a statement of assertion (A) is followed by a statement of reason (R).
1. If both Assertion & Reason are true and the reason is the correct explanation of the assertion, then mark (1)
2. If both Assertion & Reason are true but the reason is not the correct explanation of the assertion, then mark (2)
3. If Assertion is true statement but Reason is false, then mark (3)
4. If both Assertion and Reason are false statements, then mark (4)
- 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
From NCERT
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Plants growing in a partially dark environment will grow toward light in a response called phototropism. Which of the following statements is true regarding phototropism?
| 1. | It is caused by an electrical signal. |
| 2. | One chemical involved is ethylene. |
| 3. | Auxin causes a growth increase on one side of the stem. |
| 4. | Auxin causes a decrease in growth on the side of the stem exposed to light. |
Subtopic: Â Growth Hormones & Auxin |
 79%
From NCERT
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Which of the following statements applies to plant growth regulators?
| 1. | They only act by altering gene expression |
| 2. | They often have a multiplicity of effects |
| 3. | They function independently of other hormones. |
| 4. | They directly control plant protein synthesis and assembly. |
Subtopic: Â Growth Hormones & Auxin |
 60%
From NCERT
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