A) GAA
B) IBA
C) NAA
D) 2, 4-D
Correct Answer: B
Solution :
IBA (Indole Butyric Acid) is both-natural and synthetic auxin. Auxin promotes root initiation at concentration, which is inhibitory for growth of intact root. GA (Gibberellin) is second important growth hormone found in plant. It stimulates internode growth, maleness, bolting etc. NAA is synthetic auxin. In its dilute forms, it can promote rooting. 2,4-Dichlorophenoxy acetic acid (2,4-D) is a synthetic auxin, which has been used as weedicides.
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