Phytochrome is converted from the inactive to the active form by being exposed to light of what color?
A) Far red
B) Red
C) Yellow
D) Blue
E) Violet

Question

Phytochrome is converted from the inactive to the active form by being exposed to light of what color?  
A) Far red
B) Red
C) Yellow
D) Blue
E) Violet

Quizplus · Accepted Answer

Phytochrome is a photoreceptor pigment in plants that plays a critical role in regulating various developmental and physiological processes. It exists in two forms, the inactive Pr (red light-absorbing) and the active Pfr (far-red light-absorbing). When exposed to red light, Pr is converted into Pfr, whereas far-red light (in the wavelength range of 700-800nm) causes Pfr to convert back to Pr. Hence, red light is the best choice for converting phytochrome into its active form.

Phytochrome Is Converted from the Inactive to the Active Form