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
E) 2 hours light/20 hours dark/2 hours light

Question

Quizplus · Accepted Answer

A short-day plant requires uninterrupted darkness longer than its critical night length to flower. A light flash during the dark period, as in option D, interrupts the dark period, preventing flowering.

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