Multiple choice

Which of the following is not PGR

  1. Auxin

  2. GA

  3. Polyphenols

  4. Cytokinine

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

Plant Growth Regulators (PGRs) include auxins, gibberellins (GA), cytokinins, abscisic acid, and ethylene. Polyphenols are secondary metabolites involved in defense and pigmentation, not primary growth regulation.