Question

First natural cytokinin was discovered by

• A. Skoog and Miller
• B. Letham
• C. Benson and Calvin
• D. Thimann and Went

Answer 1

Answer: (A)

Skoog and Miller

The first cytokinin was isolated from herring sperm in 1955 by Miller and his associates . This compound was named kinetin because of its ability to promote cytokinesis. Hall and deRopp reported that kinetin could be formed from DNA degradation products in 1955. The first naturally occurring cytokinin was isolated from corn in 1961 by Miller. It was later called zeatin.

Therefore, the correct answer is option A.