Question

In short day plants, flowering is induced by

• A. photoperiod less than 12 hours 76.
• B. photoperiod below a critical length and uninterrupted long night
• C. long night
• D. short photoperiod and interrupted long night.

Answer 1

Answer: (B)

No flowering takes place if the dark period is less than the critical day length. The flowering is inhibited if weak intensity of light is given during the dark period. If the dark period is interrupted mid way by even a single flash of light, no flowering takes place. If this flash is given in the beginning or near the end of the dark phase, they produce flowers.