Match List I with List II and select the correct answer using the code given below the lists : Code :List I
(Plant Hormone)List II
(Physiological Function)a. Auxins i. Fruit ripening b. Gibberellins ii. Stem elongation c. Cytokinins iii. Cell division d. Ethylene iv. Cell growth
a-iv, b-ii, c-iii, d-i
Plant hormones (phytohormones) are chemical regulators that control growth, development and responses of plants. Each of the four listed hormones has one characteristic function.
a. Auxins (such as IAA) promote cell growth by cell enlargement at shoot tips, and also control apical dominance and rooting of cuttings, so a matches iv.
b. Gibberellins cause marked elongation of the stem and internodes, as seen in bolting and in increasing the length of sugarcane stems, so b matches ii.
c. Cytokinins promote cell division (cytokinesis) and delay leaf senescence, so c matches iii.
d. Ethylene is a gaseous hormone that hastens fruit ripening, so d matches i.
The resulting code a-iv, b-ii, c-iii, d-i is unique; every other code pairs ethylene or cytokinins with a function they do not mainly control.
a-iv, b-ii, c-iii, d-i option is correct.
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