Question

Phytochrome occurs in two forms. In which form it promotes the germination of seeds of some species?

• A. $P_{fr}$ forms
• B. $P_r$ forms
• C. Both of (A) and (B)
• D. None of the above

Answer 1

The correct option is A $P_{fr}$ forms

Phytochrome is a photoreceptor, a pigment that plants use to detect light. It is sensitive to light in the red and far-red region of the visible spectrum. Many flowering plants use it to regulate the time of flowering based on the length of day and night (photoperiodism) and to set circadian rhythms. Pfr promotes germination of seeds.