A) \[\text{IAA}\]
B) Gibberellin
C) 2,4-D
D) ABA
Correct Answer: A
Solution :
\[\text{IAA}\] (mdole-3-acetic acid) is the best known natural auxin. Natural auxins are synthesized in physiologically active parts of plants such as shoot apices, leaf primordia and developing seeds, buds (apex), embryos from ammo acid tryptophan. Auxins are concerned with cell elongation, control of abscission layer, lowering etc. Thus, these are growth promoting hormones.
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