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WBCS Preliminary Examination 2015 — General Studies · Question 129 of 200

Q129
General ScienceBiology
Which one of the following is the natural auxin?
  1. a.NAA
  2. b.IAA
  3. c.2, 4-D
  4. d.IBA

Answer: (B) IAA

IAA (Indole-3-Acetic Acid) is the primary naturally occurring plant hormone of the auxin class. It is predominantly produced in the apical buds and young leaves and regulates cell elongation, root initiation, and phototropism. NAA, 2,4-D, and IBA are all synthetic auxins used in agriculture.

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