A) 2, 4-D
B) \[IBA\]
C) \[IAA\]
D) \[ABA\]
Correct Answer: A
Solution :
2,4-D (2, 4-dichloro-phenoxy acetic acid) is a synthetic auxin. It is a selective weedicide and kills broad leaved dicot plants only. Indole butyric acid (IBA) is also a synthetic auxin but it induces rooting of cuttings. Indole acetic acid (IAA) is a well known natural auxin. Abscisic acid (ABA) is a natural plant grwoth regulator.
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