Question

Which photoreceptor controls the opening & closing of stomata?

• A. Chlorophylls a
• B. Chlorophylls b
• C. Phytochrome
• D. Carotene

Answer 1

The correct option is C Phytochrome

Plants have photoreceptors, which are proteins that are specially designed to perceive light and signal certain biological effects in the plant. There are two types of photoreceptor proteins in plants - Phytochromes and Blue light receptors. Phytochromes absorb red light and far red light and help the plants to sense seasonal changes in night length, or photoperiod, thereby controlling the opening and closing of stomata.