What happens to phytochromes after several days of dark, rainy weather?

A) Pr and Pfr become unstable and both are destroyed.
B) Pr and Pfr are both formed from inactive phytochrome.
C) Pr stimulates flowering.
D) Pfr spontaneously reverts to Pr.
E) Pr absorbs darkness and converts to Pfr.


D

Biology & Microbiology

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