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

1. abscisic acid

2. Ethylene

3. GA₃             

4. lndole acetic acid

During seed germination its stored food is mobilised by.

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

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. 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

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

1. vessels and tracheid differentiation

2. leaf abscission

3. annual plants

4. floral parts
 

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