Question

One of the synthetic auxins is:

• A. IBA
• B. NAA
• C. IAA
• D. GA

Answer 1

The correct option is B

NAA

NAA is a synthetic auxin. Some of the most widely used weed killers are synthetic auxins. Synthetic auxin analogs include 1-naphthaleneacetic acid (NAA) and 2, 4-dichlorophenoxy acetic acid (2,4,5-T).
IBA (Indole butyric acid) and IAA(Indole acetic acid) are naturally occurring plant hormone of the auxin class. Gibberellic acid (GA) is a hormone found in plants and fungi.