What are sunflowers like at night?

This summer vacation, I spent it at my grandmother's house in the country. There, I met many animals and plants, and the sunflower left the deepest impression on me. Sunflower has a corolla like a washbasin. The most amazing thing is that it can always face the sun, as if the sun has a magical attraction to attract it tightly. However, I suddenly thought of a question, that is, when the sunflower faces west at night, how did its corolla turn back the next morning after one night? Because there is no sun at night! I asked my grandmother first, and she said, "How do I know?" Later, I asked many rural grandfathers, and they all shook their heads and couldn't explain clearly. So, I decided to find out for myself! Didn't the teacher always say that "practice is the only criterion for testing truth"? I just need to pay attention to observation to solve the problem. So, I started my observation plan. I first observed that when the sun went down, the sunflower's corolla was facing west. At night, at 1 1, it was still stubbornly facing west, and there was no sign of turning back to shore. I have no choice but to go back to my room and sleep. The next day before the sun came out, I got up again and hurried to the sunflower. At first glance, it is still looking forward to the west, as if it will not stop until the sun comes out. After a long time, the sun finally rose slowly from the east. At this point, the sunflower's "head" is still stubbornly motionless, as if it will never look back until the sun rises in the west. After a long time, I actually found that the direction of sunflower corolla changed a little and began to slowly turn to the east. Miracle! Miracle! When the sun rises to the top of the tree, its corolla turns back to the east. What the hell is going on here? Why does the corolla of sunflower always face the sun? I quickly turned on my father's computer and searched it on Baidu, only then did I know what was going on. It turns out that "there is an auxin in the neck of sunflower, which is mainly formed at the shoot tip and transported to the base." The distribution of auxin is influenced by light: the concentration of auxin is low on the light side and high on the backlight side. In this way, the growth area on the illumination side grows slowly, and the growth area on the backlight side grows faster, so that the stem bends phototropically. In recent years, with the improvement of science and technology, scientists have made a new supplement to the explanation of sunflower sunshine phenomenon. They found a high concentration of lutein in the growing area of sunflower stems. This substance, contrary to auxin, inhibits cell elongation. Scientific experiments show that when the light is irradiated from one side for 30 minutes, the concentration distribution of xanthogen in the leaves on both sides of the sunflower seedling growth area is: the concentration on the sunny side is high, and the concentration on the backlight side is low. This is just the opposite of the concentration distribution law of auxin. In that case, sunflower has a lot to do with pepper oil. In other words, the sunlight of sunflower is the result of the joint action of auxin and lutein. How wonderful nature is! Sunflower Sunrise has such a profound scientific truth! At this moment, I had a strange idea. Sunflowers have the characteristics of sunrise. So, are there any other plants? Do animals have anything to do with us? I am determined to further observe and uncover the magic and mystery of nature one after another!