A) Skoog and Miller
B) Letham
C) Benson and Calvin
D) Thimann and Went
Correct Answer: B
Solution :
The first natural cytokinin was obtained from unripe maize grains or Kernels by Letham et. al. (1964) and it is known as zeatin (6-hydroxy 3-methyl trans 2-butenyl amino purine).
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