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Question

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

(a) Fruit ripener (i) Abscisic acid
(b) Herbicide (ii) GA3
(c) Bolting agent (iii) 2, 4-D
(d) Stress hormone (iv) Ethephon

Select the correct option from following.

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

The correct option is C (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 - (GA3)

Gibberellic acid (GA3) 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.

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