Q. No.Which one of the following growth regulators is known as "stress hormone" ?
1. Abscisic acid
2. Ethylene
3.
4. lndole acetic acid
1. Abscisic acid
2. Ethylene
3.
4. lndole acetic acid
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During seed germination, its stored food is mobilised by:
| 1. | ethylene | 2. | cytokinin |
| 3. | ABA | 4. | gibberellin |
Phototropic curvature is the result of uneven distribution of.
1. gibberellin
2. phytochrome
3. cytokinins
4. auxin
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Coiling of garden pea tendrils around any support is an example of
1. thigmotaxis
2. thigmonasty
3. thigmotropism
4. thermotaxis
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Which one of the following acids is a derivative of carotenoids?
| 1. | Indole-butyric acid | 2. | Indole-3-acetic acid |
| 3. | Gibberellic acid | 4. | Abscisic acid |
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Importance of day length in flowering of plants was first shown in
1. Lemna
2. tobacco
3. cotton
4. Petunia
Opening of floral buds into flowers, is a type of:-
1. autonomic movement of locomotion
2. autonomic movement of variation
3. paratonic movement of growth
4. autonomic movement of growth
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Which one of the following pairs, is not correctly matched?
1. Abscisic acid - Stomatal closure
2. Gibberellic acid - Leaf fall
3. Cytokinin - Cell division
4. IAA - Cell wall elongation
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