A) phenylalanine
B) tryptophan
C) Cycas
D) Pteris
Correct Answer: C
Solution :
Kogl and Haagen-smit introduces the term auxin. They isolated three chemical auxin-a (from human urine), auxin-b (from corn germ oil) and heteroauxin (from human urine), out of these heteroauxin proved to be real auxin. It is indole-3-acetic acid or LAA. It is synthesised mainly from tryptophan in shoot apex and developing seeds. 1AA is a natural auxin. So, tryptophan is precursor of 1AA. Tryosine is precursor of thyroxine and adrenalin. Phenylalanine is precursor of pigment, melanin.
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