Question

First I natural cytokinin isolated from unripe maize grains is (1)Kinetin L(2)Zeatin (3)Dormin (4)florigen

Answer 1

Answer:

Zeatin

Explanation:

It is another growth hormone that promotes cell division. Letham coined the term cytokinin. The first cytokinin was discovered by Skoog and Miller (1954) during investigation of nutritional requirements of callus tissue culture of Nicotiana tabacum (Tobacco). They observed that the callus proliferated when the nutrient medium was supplemented with coconut milk and degraded a sample of DNA (obtained from herring sperm). They named it as kinetin. Chemically kinins are 6-furfury! amino purine. First natural cytokinin was obtained from unripe maize grains by Letham et al. It is known as Zeatin. 6-benzyl adenine is a synthetic cytokinin hormone.