Question

Match the following:

Column I	Column II
a. Weedicide	(i) GA${}_3$
b. Bolting	(ii) Cytokinin
c. Thinning of cotton	(iii) Ethylene
d. Lateral shoot growth	(iv) 2,4-D

• A. a(iii), b(ii), c(iv), d(i)
• B. a(iv), b(i), c(iii), d(ii)
• C. a(iv), b(i), c(ii), d(iii)
• D. a(iv), b(ii), c(iii), d(i)

Answer 1

The correct option is B a(iv), b(i), c(iii), d(ii)

GA${}_3$ was one of the first gibberellins discovered. Gibberellins are plant growth promoters that help in germination of seeds and elongation of internodes just before flowering (bolting), stimulation of flowers.

2,4-D belongs to the category of auxins, a type of plant growth promoter. It is used as a weedicide which are chemicals that destroy unwanted plants called weeds. It kills dicots but does not affect the monocots.

Ethylene is a plant growth promoter as well as a plant growth inhibitor. It helps in the ripening of fruits. It also helps accelerate natural detachment (called abscission) of flowers and fruits (thinning of cotton, cherry, walnut).

Cytokinin is a plant growth promoter that has useful effects on cytokinesis. It helps to produce new leaves, chloroplast in leaves, lateral shoot growth, adventitious shoot formation.