Plants follow different pathways in response to environment or phases of life to form different kinds of structures. This ability is called:
| 1. | Plasticity | 2. | Maturity |
| 3. | Elasticity | 4. | Flexibility |
The site of perception of light in plants during photoperiodism is:
1. Axillary bud
2. Leaf
3. Shoot apex
4. Stem
The plant hormone used to destroy weeds in a field is:
| 1. | 2, 4-D | 2. | IBA |
| 3. | IAA | 4. | NAA |
Coconut milk factor is:
1. An auxin
2. A gibberellin
3. Abscisic acid
4. Cytokinin
Seed dormancy is due to:
| 1. | Ethylene | 2. | Abscisic acid |
| 3. | IAA | 4. | Starch |
Which of the following PGR is present in coconut milk which is used in tissue culture?
| 1. | Cytokinin | 2. | Auxin |
| 3. | Gibberellin | 4. | Ethylene |
Which hormone is responsible for fruit ripening:
| 1. | Ethylene | 2. | Auxin |
| 3. | Ethyl chloride | 4. | Cytokinin |
If the apical bud has been removed then we observe:
1. More lateral branches
2. More axillary buds
3. Plant growth stops
4. Flowering stops
Cell elongation in internodal regions of the green plants takes place due to:
| 1. | Cytokinins | 2. | Gibberellins |
| 3. | Ethylene | 4. | Indole acetic acid |
The maximum growth rate occurs in:
| 1. | Senescent phase |
| 2. | Lag phase |
| 3. | Exponential phase |
| 4. | Stationary phase |