Q. No.
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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
How does pruning help in making the hedge dense?
| 1. | It induces the differentiation of new shoots from the rootstock |
| 2. | It frees axillary buds from apical dominance |
| 3. | The apical shoots grow faster after pruning |
| 4. | It releases wound hormones |
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Treatment of seed at low temperature under moist conditions to break its dormancy is called
1. scarification
2. vernalization
3. chelation
4. stratification
An enzyme that can stimulate germination of barley seeds is:-
1. α-amylase
2. lipase
3. protease
4. invertase
One set of a plant was grown at 12 hours a day and 12 hours night period cycles and it flowered while in the other set, night phase was interrupted by a flash of light and it did not produce a flower. Under which one of the following categories will you place this plant?
1. Darkness neutral
2. Day neutral
3. Short day
4. Long day
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