Multiple choice

Plant growth hormones extracted from a fungus and a fish are respectively

  1. auxins and 2, 4-D

  2. ethylene and cytokinin

  3. gibberellin and kinetin

  4. gibberellin and zeatin
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Gibberellins were first discovered from the fungus Gibberella fujikuroi causing foolish seedling disease in rice. Kinetin (a cytokinin) was isolated from herring sperm DNA. Auxins occur naturally in plants, and 2,4-D is synthetic. Ethylene is a gaseous hormone produced by plants.

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