A) Phenyl acetic acid
B) a-naphthalene acetic acid
C) Indole acetic acid
D) Indole butyric acid
Correct Answer: D
Solution :
Many new plants are usually propogated by stem cutting. If we dip to the lower cut end of a cutting in dilute solution of auxins (especially IBA) very soon large number of roots are developed on the cut ends due to which these cutting develop into successful plants.
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