A flash of red light followed by a flash of far-red light given during the middle of the night to a short-day plant will likely
A) cause increased flower production.
B) have no effect upon flowering.
C) inhibit flowering.
D) stimulate flowering.
E) convert florigen to the active form.

Question

Quizplus · Accepted Answer

Short-day plants typically flower when the night is long enough. A flash of red light followed by far-red light essentially resets the plant's phytochrome system to its daytime state, thus having no effect on the flowering process as if the night interruption did not happen.

A Flash of Red Light Followed by a Flash of Far-Red