Which one among the following is not a plant hormone?

  1. A. Gibberellins
  2. B. Abscisic acid
  3. C. Auxins
  4. D. Thyroxine

Correct Answer: D. Thyroxine

Explanation

Thyroxine is a hormone produced by the thyroid gland in humans and other vertebrates; Gibberellins, Abscisic acid, and Auxins are all primary plant hormones.

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