Multiple choice

Which of the following is not a plant growth hormone?

  1. Auxin

  2. Gibberlin

  3. Ascorbic acid

  4. Abscisic acid

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Auxin, gibberellin, abscisic acid, and cytokinins are the five major plant hormones that regulate growth and development. Ascorbic acid (Vitamin C) is an antioxidant and enzyme cofactor in plants, but it does not function as a growth hormone like the others.