Zeatin is a natural cytokinin. It was first isolated from:

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Autoclaved herring sperm DNA

Yeast extract

Tobacco callus

Corn kernels

answer is D.

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Detailed Solution

Search for natural substances with cytokinin-like activities led to the isolation of zeatin from corn kernels and coconut milk. Since the discovery of zeatin, several naturally occurring cytokinins, and some synthetic compounds with cell division promoting activity, have been identified.

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