Which one of the following growth regulators is known as "stress hormone" ?

1. abscisic acid

2. Ethylene

3. GA₃             

4. lndole acetic acid

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

1. Lemna

2. tobacco

3. cotton

4. Petunia

One of the synthetic auxin is 

1. NAA

2. IAA

3. GA

4. IBA

Phototropic curvature is the result of uneven distribution of.

1. gibberellin

2. phytochrome

3. cytokinins

4. auxin

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

Photoperiodism was first characterised in :-

1. tobacco

2. potato

3. tomato 

4. cotton

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

Coiling of garden pea tendrils around any support is an example of 
1. thigmotaxis
2. thigmonasty 
3. thigmotropism
4. thermotaxis

During seed germination its stored food is mobilised by.

1. ethylene
2. cytokinin
3. ABA
4. gibberellin