Poinsettias require a _______ to produce colored bracts.
A) short day photoperiod
B) long day photoperiod
C) cool day temperature regime
D) cool night temperature regime
Answer: A) short day photoperiod
Biology Questions and Answers.
A) short day photoperiod
B) long day photoperiod
C) cool day temperature regime
D) cool night temperature regime
Answer: A) short day photoperiod