Plant Growth and DevelopmentHard
Question
Importance of day length in flowering of plants was first shown in
Options
A.Lemna
B.tobacco
C.cotton
D.Petunia
Solution
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 darkning. On the basis of photoperiodic response to flowering plants been divided into short day plants (tobacco), long day plant (eg, wheat, hanbane), short long day plants.(eg, Campanula), long short day plants (eg, Beyophyllum) intermediate plants (eg, wild kidney bean) and day neutral plants (eg, cotton).
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