- 1(current)
Q. No.The phenomenon which is influenced by auxin and also played a major role in its discovery is:
| 1. | Phototropism | 2. | Root initiation |
| 3. | Gravitropism | 4. | Apical Dominance |
Subtopic: Â Growth Hormones & Auxin |
 63%
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Consider the given two statements:
| Assertion (A): | Auxins promote stem elongation and inhibit growth of lateral buds |
| Reason (R): | Auxins are transported unidirectionally from the stem apex downwards. |
| 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. | (A) is False but (R) is True. |
Subtopic: Â Growth Hormones & Auxin |
From NCERT
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Which plant growth regulators, respectively, prevent and promote leaf abscission in plants?
1. Auxin and Ethylene
2. Auxin and Abscisic Acid
3. Gibberellin and Cytokinin
4. Abscisic Acid and Ethylene
1. Auxin and Ethylene
2. Auxin and Abscisic Acid
3. Gibberellin and Cytokinin
4. Abscisic Acid and Ethylene
Subtopic: Â Growth Hormones & Auxin |Â Ethylene |
From NCERT
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F. Skoog and his co-workers observed that from the internodal segments of tobacco stems the callus proliferated only if extracts of vascular tissues or yeast extract or coconut milk or DNA supplements the medium already containing:
1. Auxins
2. Gibberellins
3. Ethylene
4. Kinetins
1. Auxins
2. Gibberellins
3. Ethylene
4. Kinetins
Subtopic: Â Growth Hormones & Auxin |
From NCERT
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Given below are two statements:
In light of the above statements, choose the most appropriate answer from the options given below:
| Statement I: | Cytokinins help to initiate rooting in stem cuttings during plant propagation. |
| Statement II: | In most cases, ABA acts as a synergist to Gibberellins. |
| 1. | Statement I is correct but Statement II is incorrect. |
| 2. | Statement I is incorrect but Statement II is correct. |
| 3. | Both Statement I and Statement II are correct. |
| 4. | Both Statement I and Statement II are incorrect |
Subtopic: Â Growth Hormones & Auxin |Â Gibberellin |Â Cytokinin |
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To promote stem elongation, gibberellins act in concert with:
| 1. | Auxins | 2. | Cytokinins |
| 3. | Ethylene | 4. | ABA |
Subtopic: Â Growth Hormones & Auxin |Â Auxin Function |Â Gibberellin |
 50%
From NCERT
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- 1(current)
Q. No.
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