If a short-day plant has a critical night length of 15 hours,then which of the following 24-hour cycles will prevent flowering?
A)8 hours light/16 hours dark
B)4 hours light/20 hours dark
C)6 hours light/2 hours dark/light flash/16 hours dark
D)8 hours light/8 hours dark/light flash/8 hours dark

Question

Quizplus · Accepted Answer

A short-day plant requires uninterrupted darkness longer than its critical night length to flower. In option D, the light flash interrupts the dark period, preventing the plant from perceiving a continuous dark period longer than 15 hours, thus preventing flowering.

If a Short-Day Plant Has a Critical Night Length of 15