Plant Growth and Development

Root development is promoted by

1. abscisic acid
2. auxin
3. gibberellin
4. ethylene

Phototropic curvature is the result of uneven distribution of

1. gibberellin
2. phytochrome
3. cytokinins
4. auxin

Photoperiodism was first characterised 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. IAA
2. GA
3. IBA
4. NAA

Which one of the following acids is a derivative of carotenoids?

1. Indole-3-acetic acid
2. Gibberellic acid
3. Abscisic acid
4. Indole butyric acid

Importance of day length in flowering of plants was first shown in

1. cotton
2. Petunia
3. Lemna
4. tobacco

Senescence as an active developmental cellular process in growth and functioning of a flowering plant, is indicated in

1. annual plants
2. floral parts
3. vessels and tracheid differentiation
4. leaf abscission

The wavelength of light absorbed by Pr form of phytochrome is

1. 680 nm
2. 720 nm
3. 620 nm
4. 640 nm

Which one of the following pairs, is not correctly matched?

1. Gibberellic acid - Leaf fall
2. Cytokinin - Cell division
3. IAA - Cell wall elongation
4. Abscisic acid - Stomatal closure