Q. Which plant growth regulator is responsible for triple response?
A) $C_{2}H_{4}$
B) IAA
C) IBA
D) ABA
Explanation
Firstly, a Russian Physiologist Dimitry N Nelijubow who established ethylene’s triple response on pea seedling. These triple responses are (a) inhibited stem elongation (b) increased stem thickening (c) horizontal growth habit
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.