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Q. No.
Assertion (A):
Many plant biologists prefer the term ‘plant growth regulator’ rather than ‘plant hormone’ to describe organic compounds that modify or control one or more physiological processes within a plant.
Reason (R):
Plant hormones do not activate a signal transduction pathway.
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: Growth Hormones & Auxin |
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| Assertion (A): | Auxin, produced predominantly in shoot tips, is transported from cell to cell down the stem and this is called as polar transport. |
| Reason (R): | The polar transport is due to the gravitational forces. |
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: Auxin Function |
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
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| Assertion (A): | Over a certain concentration range, Auxin stimulates elongation of cells within young developing shoots. |
| Reason (R): | In shoot’s region of elongation, auxin stimulates the plasma membrane proton pumps. |
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: Growth Hormones & Auxin | Auxin Function |
56%
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NEET 2025 - Target Batch
Hints
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R):
| Assertion (A): | Spraying cereal fields with 2,4-D eliminates monocot weeds. |
| Reason (R): | Dicots can rapidly inactivate synthetic auxins. |
In the light of the above statements choose the correct answer from the options given below:
| 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: Auxin Function |
65%
To view explanation, please take trial in the course.
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| Assertion: | If leaves removed from a plant are dipped in a cytokinin solution, they stay green much longer than otherwise. |
| Reason: | Cytokinins have an anti-aging effect of certain plant organs like leaves. |
| 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: Cytokinin |
75%
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NEET 2025 - Target Batch
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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R):
| Assertion (A): | Mutants that overproduce cytokinins or plants treated with cytokinins tend to be bushier than normal. |
| Reason (R): | Cytokinins help overcome the apical dominance. |
In the light of the above statements choose the correct answer from the options given below:
| 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: Cytokinin |
76%
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| Assertion (A): | Cytokinins have also been used against plants by certain pathogens like Agrobacterium tumefaciens. |
| Reason (R): | Coevolution does not always work to the plant’s advantage. |
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: Cytokinin |
52%
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R):
| Assertion (A): | Application of gibberellins can restore normal growth and development in all dwarf mutants. |
| Reason (R): | Gibberellins act antagonist to auxin to promote stem elongation. |
In the light of the above statements choose the correct answer from the options given below:
| 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: Gibberellin |
To view explanation, please take trial in the course.
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| Assertion: | Some seeds that normally require certain environmental conditions to germinate, break dormancy if they are treated with gibberellins. |
| Reason: | Gibberellins stimulate the synthesis of digestive enzymes that mobilize stored nutrients |
| 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: Gibberellin |
70%
To view explanation, please take trial in the course.
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| Assertion (A): | The levels of ABA may increase 100-fold during seed maturation. |
| Reason (R): | The high levels of ABA in maturing seeds inhibit germination. |
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: Abscisic Acid |
66%
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
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