A) IAA
B) GA
C) 2, 4-D
D) ABA
Correct Answer: C
Solution :
2, 4-D (2, 4-dichlorophenoxy acetic acid) is a synthetic auxin. Other synthetic auxins are NAA (Naphthalene Acetic Acid), IPA (Indole Propionic Acid), IBA (Indole Butyric Acid) etc. IAA (Indole Acetic Acid) is common natural auxin. It is used in tissue culture. GA (Gibberellic Acid) is natural plant hormone. It is used for intemodal elongation. ABA (Abscisic Acid) is the natural growth inhibitor. It counteract the effect of auxins, gibberellins and cytokinins.
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