A) Auxin
B) Gibberellin
C) Cytokinin
D) 2, 4-D
Correct Answer: B
Solution :
Yabuta and Sumuki isolated gibberellins in crystal form from the fungus Fusarium moniliforme (Gibberella fujikuroi) (causing bakanoe disease of rice. Indole 3-acetic acid (IAA) is the universal natural auxin. It was discovered by Kogl et.al (1934). Auxin is synthesized in shoot apices, leaf primordia and developing seed from amino acid tryptophan. 2 : 4 D ( 2 : 4 dichlorophenoxy acetic acid) is a synthetic auxin. The first cytokinin was discovered from degraded autoclaved Herring sperm DNA by Miller et.al., 19S5. It is called kinetin (6 furfuryl amino purine).
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