A) IAA and IBA are natural but NAA, 2, 4-D and 2, 4, 5-T are synthetic auxins.
B) IAA and NAA are natural but IBA, 2, 4, 5-T and 2, 4-D are synthetic auxin.
C) NAA and 2, 4, 5-T are natural but IAA, IBA and 2, 4-D are synthetic auxins.
D) IAA, NAA, IBA, 2, 4-D and 2, 4, 5-T are synthetic auxins.
Correct Answer: A
Solution :
[a] Natural auxin are naturally occurring auxin plants hormone which is called phytohormones. Eg. IAA and IBB. These are synthesized in shoot apices, leaf primordial and developing seeds from tryptophan. Some of the important synthetic auxins are 2, 4-D; 2, 4, 5-T (2, 4, 5- trichlorophenoxy acetic acid).
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