Importance of day length in flowering of plants was first shown in

Options

(a) lemna
(b) tobacco
(c) cotton
(d) petunia

Correct Answer:

tobacco

Explanation:

Photoperiodism was first studies by Garner and Allard (1920). They observed that “Maryland Mammoth” variety of tobacco could be made to flower in summer by reducing the light hours with artificial darkening. It could be made to remain vegetative in winter by providing extra light.