Q. Importance of day length in flowering of plants was first shown in
A) Petunia
B) Lemna
C) Tobacco
D) Cotton
Explanation
[Solution from source] Garner and Allard (1920) discovered photoperiodism while working with the Maryland Mammoth variety of tobacco, which flowered only when days became short. The other plants were not the organisms in which the effect was first shown. Answer (3).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.