80.Phytochrome is involved in A. Phototropism B. Photorespiration C. Photoperiodism D. Geotropism
Phytochromes are photoreceptors present in plants which are used to detect light. They are sensitive to red and far-red wavelength of light. It is involved in photoperiodism in many flowering plants. It is used to regulate the time of flowering based on the length of day and night. Thus, the correct answer is option A
