Question

Match the following concerning the activity/function and the phytohormone involved:

(a)	Fruit ripener	(i)	Abscisic acid
(b)	Herbicide	(ii)	$G{A}_3$
(c)	Bolting agent	(iii)	2, 4-D
(d)	Stress hormone	(iv)	Ethephon

Select the correct option from following.

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

Answer 1

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

(a) Fruit ripener – Ethephon

Ethephon is the most widely used commercial source of ethylene. It hastens fruit ripening.

(b) Herbicide - 2, 4-D

2, 4-D (2,4-dichlorophenoxyacetic acid) is a synthetic auxin widely used as herbicide. Herbicides are chemicals that kill or inhibit the growth of unwanted plants such as weeds. 2, 4-D kills dicotyledonous weeds.

(c) Bolting agent - ($G{A}_3$)

Gibberellic acid ($G{A}_3$) promotes bolting (internode elongation just prior to flowering) and this helps the elongation of the plants.

(d) Stress hormone - Abscisic acid (ABA)

ABA is derived from carotenoids. It helps plants to overcome situations of stress and is thus known as stress hormone.