試題詳解

21. If a long-day plant has a critical night length of 11 hours, which of the 24-hour cycles would prevent flowering?
(A) 16 hours light/8 hours dark
(B) 12 hours light/12 hours dark
(C) 15 hours light/9 hours dark
(D) 4 hours light/8 hours dark/4 hours light/8 hours dark
(E) 8 hours light/8 hours dark/light flash/8 hours dark