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Q. No.How many of the given statements regarding auxins are true?
I:
Auxins was first isolated from human urine.
II:
Auxins like IAA and indole butyric acid (IBA) have been isolated from plants.
III:
NAA (naphthalene acetic acid) and 2, 4-D (2, 4-dichlorophenoxyacetic) are synthetic auxins.
IV:
They help to initiate rooting in stem cuttings, an application widely used for plant propagation.
V:
They are widely used as herbicides.
1. 2
2. 3
3. 4
4. 5
Subtopic: Growth Hormones & Auxin | Auxin Function |
76%
From NCERT
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Which of the following is ‘open’ in plants?
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
| I: | Growth |
| II: | Development |
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
Subtopic: Growth | Development |
72%
From NCERT
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2,4-D:
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
| I: | is a natural auxin. |
| II: | is used to kill monocot weeds |
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
Subtopic: Growth Hormones & Auxin | Auxin Function |
68%
From NCERT
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A plant growth regulator can be sprayed on sugarcane to increase the yield significantly. Identify the PGR:
| 1. | ABA | 2. | Gibberellin |
| 3. | Auxin | 4. | Ethylene |
Subtopic: Gibberellin |
93%
From NCERT
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Cytokinin in flowering plants does not:
1. help to produce new leaves
2. promotes the formation of chloroplasts in leaves
3. inhibit lateral shoot growth
4. promote adventitious shoot formation
1. help to produce new leaves
2. promotes the formation of chloroplasts in leaves
3. inhibit lateral shoot growth
4. promote adventitious shoot formation
Subtopic: Cytokinin |
82%
From NCERT
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“Bakane” – “Foolish seedling" disease in rice is caused by:
| 1. | auxins | 2. | gibberellins |
| 3. | cytokinins | 4. | ethylene |
Subtopic: Gibberellin |
91%
From NCERT
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Which of the following plant growth regulators enhances the respiration rate during ripening of the fruits?
| 1. | ABA | 2. | Ethylene |
| 3. | Auxins | 4. | Cytokinins |
Subtopic: Ethylene |
94%
From NCERT
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Subtopic: Gibberellin |
86%
From NCERT
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Opening and closing of stomata in response to environmental conditions is mainly regulated by:
| 1. | gibberellins | 2. | cytokinins |
| 3. | abscisic acid | 4. | auxins |
Subtopic: Abscisic Acid |
87%
From NCERT
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Plant hormones that affects stem elongation to the greatest extent would be:
| 1. | gibberellin | 2. | cytokinin |
| 3. | abscisic acid | 4. | ethylene |
Subtopic: Gibberellin |
83%
From NCERT
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