Which of the Following Treatments Would Enhance the Level of the Pfr

Question

Which of the following treatments would enhance the level of the Pfr form of phytochrome?
A) exposure to far-red light
B) exposure to red light
C) long dark period
D) inhibition of protein synthesis
E) synthesis of phosphorylating enzymes

Accepted Answer

Exposure to red light converts the Pr form of phytochrome to the Pfr form, which is the active form involved in initiating various plant developmental processes such as seed germination and flowering.