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  4. First natural cytokinin, zeatin was discovered by:

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Q. First natural cytokinin, zeatin was discovered by:

J & K CETJ & K CET 2002

Solution:

Zeatin was obtained by Letham (1963) in crystalline form from immature maize grain who named it as, and identified as $6$ ($4$ hydroxy $3$ methyl trans-$2$ butenyl) aminopurine.