A) 2, 4-D
B) IBA
C) IPA
D) IAA
Correct Answer: D
Solution :
Auxins are generally acidic substances having an unsaturated ring structure. Indole 3-Acetic acid is the universal natural auxin discovered by Kogl et. al., (1934). Auxin is synthesized in shoot apices, leaf primordia and developing seed from amino acid tryptophan. The important synthetic auxins are 2: 4-D, 2:4:5 T, IBA, NAA, MCPA etc.
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