The wavelength of light absorbed by Pr form of phytochrome is:
1. 640 nm
2. 680 nm
3. 720 nm
4. 620 nm
"Foolish seedling" disease of rice led to the discovery of:
1. GA
2. ABA
3. 2, 4-D
4. IAA
1. Lemma
2. tobacco
3. cotton
4. Petunia
Which one of the following pairs is not correctly matched?
1. | Abscisic acid - Stomatal closure |
2. | Gibberellic acid - Leaves fall |
3. | Cytokinin - Cell division |
4. | IAA - Cell wall elongation |
Parthenocarpic tomato fruits can be produced by:
1. | removing androecium of flowers before pollen grains are released |
2. | treating the plants with low concentrations of gibberellic acid and auxins |
3. | raising the plants from vernalised seeds |
4. | treating the plants with phenylmercuric acetate |
How does pruning help in making the hedge dense?
1. | It includes the differentiation of new shoots from the rootstock |
2. | It frees axillary buds from apical dominance |
3. | The apical shoot grows faster after pruning |
4. | It releases wound hormones |
Treatment of seed at low temperature under moist conditions to break its dormancy is called:
1. sacrification
2. vernalization
3. chelation
4. stratification
An enzyme that can stimulate the germination of barley seeds is:
1. -amylase
2. lipase
3. protease
4. invertase
The 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
1. vessels and tracheid differentiation
2. leaf abscission
3. annual plants
4. floral parts.