Question
Which one is a short day plant?
Brassica campestris
Raphanus sativus
Glycine max
Papaver somniferum
Solution
C.
Glycine max
Short day plants initiate flowering when the day length (photoperiod) become shorter than a certain critical period. Most of winter flowering plants belong to this category, eg, cocklebur (Xanthimum), sugarcane, soybean (Glycine max), Chrysanthemum etc.
