A) IAA
B) Gibberellin
C) 2,4-D
D) ABA
Correct Answer: A
Solution :
IAA (lndole-3-Acetic Acid) is the best known natural auxin. Natural auxins are synthesised in physiologically active parts of plants such as shoot apices, leaf primordia and developing seeds buds (apex), embryos from amino acid tryptophan. Auxins are concerned with eel! elongation, control of abscission layer, lowering etc. Thus, these are growth promoting hormones.
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