Question

In short-day plants (SDP), flowering is induced by ______. 

Options

• short night

• interrupted dark period

• photoperiod shorter than the critical duration

• short photoperiod and interrupted long night

Answer 1

In short-day plants (SDP), flowering is induced by a photoperiod shorter than the critical duration.

Explanation:

The dark time is essential to SDP and must last continuously. The short-day plant won't flower if this dark phase is broken, even briefly, with red light.