Thank you for reporting, we will resolve it shortly
Q.
First natural cytokinin was discovered by
BVP MedicalBVP Medical 2012
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).