Q. Which one of the following growth regulators is known as 'stress hormone'?
A) Abscisic acid
B) Ethylene
C) $GA_3$
D) Indole acetic acid
Explanation
[Solution] ABA increases tolerance to stress (e.g. stomatal closure), hence 'stress hormone'. Answer (1).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.