Question

Functions of plant growth promoters and plant growth inhibitors are given here in a jumbled up manner. Select the option that correctly segregates these functions.
(i) Cell division
(ii) Cell enlargement
(iii) Pattern formation
(iv) Tropic.growth
(v) Flowering
(vi) Fruiting
(vii) Seed germination
(viii) Response to wounding
(ix) Response to stresses of biotic and abiotic origin
(x) Dormancy

	Functions of growth promoters	Functions of growth inhibitors
(a)	(i), (ii), (vii), (ix)	(iii), (iv), (v), (vi),(viii), (x)
(b)	(viii), (ix), (x)	(i), (ii), (iii), (iv), (v), (vi), (vii)
(c)	(i), (ii), (iii), (iv), (v), (vi), (vii)	(viii), (ix), (x)
(d)	(i), (ii), (iii), (iv), (v), (vi), (vii), (ix), (x)	(viii)

• A. a
• B. b
• C. c
• D. d

Answer 1

Answer: (C)

Plant Growth Hormones $(PGRs)$ or phytohormones are the organic substances which are synthesised in minute quantities in one part of the plant body and transported to another part where they influence specific physiological processes (Went and Thimann, $1937$). $PGRs$ are broadly divided into two groups— plant growth promoters and plant growth inhibitors. Plant growth promoters perform growth promoting activities like cell division, cell enlargement, pattern formation, tropic growth, flowering, fruiting and seed formation. They are three in number viz., auxins, gibberellins and cytokinins. Plant growth inhibitors have important functions in inducing plant responses to wounding, biotic and abiotic stresses, dormancy and abscission. Abscisic acid is known as plant growth inhibitor. Ethylene is largely plant growth inhibitor but is also involved in some growth promotion activities.