Question

In short day plants flowering is induced by

• A. Long night
• B. Photoperiod less than 12 hours
• C. Photoperiod shorter than initial value and uninterrupted long night
• D. Short photoperiod and interrupted long night

Answer 1

The correct option is C Photoperiod shorter than initial value and uninterrupted long night

SDP or short day plants are the plants, in which when the night lengths exceed their critical photoperiod, they cannot flower under short nights or if a pulse of artificial light is shown on the plant for several minutes during the night; they require a continuous period of darkness before floral development can begin. In SDP, the dark period is critical and must be continuous. If this dark period is interrupted even with a brief exposure of red light, the SDP will not flower.