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

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

"Foolish seedling" disease of rice led to the discovery of:

1. GA

2. ABA

3. 2, 4-D

4. IAA