Which one of the following growth regulators is known as the stress hormone?
1. Abscisic acid
2. Ethylene
3. GA3
4. Indole acetic acid
During seed germination its stored food is mobilized by:
1. Cytokinin
2. ABA
3. Gibberellin
4. Ethylene
Phototropic curvature is the result of uneven distribution of:
1. gibberellin
2. phytochrome
3. cytokinins
4. auxin
Photoperiodism was first characterized in:
1. tobacco
2. potato
3. tomato
4. cotton
Coiling of garden pea tendrils around any support is an example of:
1. thigmotaxis
2. thigmonasty
3. thigmotropism
4. thermotaxis
One of the synthetic auxin is:
1. NAA
2. IAA
3. GA
4. IBA
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
1. vessels and tracheid differentiation
2. leaf abscission
3. annual plants
4. floral parts.
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
The wavelength of light absorbed by Pr form of phytochrome is:
1. 640 nm
2. 680 nm
3. 720 nm
4. 620 nm