Which one of the following growth regulators is known as "stress hormone" ?
1. Abscisic acid
2. Ethylene
3. ${\mathrm{GA}}_3$ 
4. lndole acetic acid

During seed germination, its stored food is mobilised by:

Phototropic curvature is the result of uneven distribution of.
1. gibberellin
2. phytochrome
3. cytokinins
4. auxin

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

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

Importance of day length in flowering of plants was first shown in
1. Lemna
2. tobacco
3. cotton
4. Petunia

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

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

Which one of the following pairs, is not correctly matched?
1. Abscisic acid - Stomatal closure
2. Gibberellic acid - Leaf fall
3. Cytokinin - Cell division
4. IAA - Cell wall elongation