In short day plants, flowering is induced by [1992] (A) photoperiod less than 12 hours (B) photoperiod below a critical length and uninterrupted long night (C) long night (D) short photoperiod and interrupted long night
Option B. Short day plants are those plants that begin flowering when the photoperiod is shorter than their critical day length. They require uninterrupted long night and short period of light to flower. Long day plants are those plants that begin flowering when the photoperiod is longer than their critical day length. They will flower when they are exposed to short period of darkness and long period of light. Long day plants flower in summer and short day plants flower in spring. Examples of short day plants are rice, tobacco, cotton.
