Experiments have shown that plants contain a light-sensing protein that can resolve the intensity of light. This ability is likely to enable plants to see wavelengths invisible to human vision and have a high sensitivity. Plants can sense In the direction of the light, the light makes the plant know when to wake up in the morning, and it can also promote the plant to secrete two additional colorless pigments, quercetin and kefir. They can filter the strong sunlight and give full play to the role of sunscreen To protect plants from strong UV rays. This text mainly introduces:. ['How do plants tell the direction.', 'How Plants Avoid Sun Exposure.', 'Plants have a "visual" sense.', 'The importance of sensing sunlight for plant growth.']