Plant Growth Regulators · NCERT Biology

Kinetin, a modified form of adenine, was first discovered from:

  1. Immature coconut endosperm
  2. Autoclaved herring sperm DNA
  3. Corn kernel extracts
  4. Liquid fungal culture media
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Correct answer: Autoclaved herring sperm DNA

Skoog and Miller crystallized kinetin from autoclaved herring sperm DNA. It was the first cytokinin identified, though it does not occur naturally in plants; Zeatin was the first natural cytokinin found.

Difficulty: Medium Question 12 of 20

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