Fruit and leaf drop at early stages can be prevented by the application of 
1. Cytokinins
2. ethylene
3. auxins
4. gibberellic acid 

you are given a tissue with its potential for differentiation in an artificial culture. Which of the following pairs of hormones would you add to the medium to secure shoots as well as roots?
(1) IAA and gibberellin 

(2) Auxin and cytokinin

(3) Auxin and abscisic acid

(4) Glbberellin & abscisic acid

Phytochrome is a 
(1) flavoprotein

(2) glycoprotein

(3) lipoprotein

(4) chromoprotein

The Avena curvature is used for bioassay of 
(1) GA₃

(2) IAA

(3) Ethylene

(4) ABA

A few normal seedlings of tomato were kept in a dark room. After a few days they were

found to have become white-coloured like albinos. Which of the following terms will you

use to describe them?

1. Mutated

2. Embolised

3. Etiolated

4. Defoliated

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