Q. The following statements are given about plant growth hormones: I.Cytokinins suppress the synthesis of chlorophyll. II.Auxins control apical dominance. III.Gibberellins promote shoot elongation. IV.Abscisic acid enabling seeds to withstand desiccation. Which of the above statements are correct?

A) I and II
B) II and III
C) I and III
D) II, III and IV
Explanation

‘Cytokinin’ delay the senescence of leaves and prevents chlorophyll degradation. It can be shown by rapid bioassay technique. Cytokinin treated leaf tips retards the process of chlorophyll degradation as compared to untreated leaf discs.

Dr. Abubacker
Reviewed by Dr. Abubacker

Physics Educator & NEET/JEE Specialist

Ph.D. in Physics with 19+ years of teaching experience.