Assertion:
A correct concentration of auxin and cytokinin is required for the development of root and shoot in a callus
Reason:
When the ratio of auxin to cytokinin is high, then only roots develop but when the ratio of cytokinin to auxin is high then only shoots develop
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 Growth Hormones & Auxin |
 69%
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Assertion: Vernalization is the acceleration of subsequent flowering by low-temperature treatment.
Reason: The site of vernalization is apical meristem.
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 the assertion is true but the reason is false
4. If both assertion and reason are false statements
Reason: The site of vernalization is apical meristem.
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 the assertion is true but the reason is false
4. If both assertion and reason are false statements
 51%
From NCERT
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| Assertion (A): | Cytokinin increases shelf life of fruits and vegetables. |
| Reason (R): | Cytokinins induce cell division. |
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 Cytokinin |
 56%
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| Assertion: | ABA is also called stress hormone |
| Reason: | ABA increases the tolerance of plants to various kinds of stresses |
| 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 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: | 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
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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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