Q. Importance of day length in flowering of plants was first shown in
A) Lemna
B) Tobacco
C) Cotton
D) Pentunia
Explanation
The phenomenon of photoperiodism was first discovered by Garner and Allard (1920-1922). They observed that maryland mammoth variety of tobacco could be made to flower only by reducing the light hours with artificial darkening.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.