That morning, I carefully appreciated this beautiful plant with tall and fat green leaves and golden petals. Suddenly I was surprised to find that the sunflower tray was facing east, but I clearly remember that it was facing west when I came to see it yesterday afternoon! Did I remember wrong? Curiosity drove me to continue to observe.
At noon, the sunflower faces the sky again. This time, the sunflower is neither east nor west, facing the center of the blue sky, as if sighing in the sky. At this time, the sun has unconsciously come to my head, and the sunflower tray is just facing the sun. "This may be a coincidence!" I thought to myself.
In the evening, the sun went down slowly. Sunflower buried her red face very low, as if a naughty child had made a mistake and dared not look up. I am even more puzzled: why does the sunflower tray always follow the sun?
The next morning, I came on time again. Sure enough, the sunflower looked up slightly to the east, as if a diligent girl was thinking about a difficult problem. This confirms my idea that sunflowers must turn to the sun. On the third day, the fourth day ... after several days of observation, I confirmed my thoughts, but at the same time, I also had a question: why did the sunflower turn like this? Is this related to self-growth?
With questions, I found my learned father, but he couldn't tell me why. I have to rely on myself. I read the encyclopedia online and finally found the answer. It turns out that before the sunflower matures, the stem near the disk has a characteristic: many substances that can promote plant growth gather behind the sun, called growth hormone. Stimulated by this hormone, the growth of the backlight is faster, while the growth hormone of the sunny side is less and the growth is slower. In this way, the stem of sunflower bends to the side with the sun, and the disk faces the sun.
Ah! This is a vast world, and there are many miracles outside. I believe there must be more interesting plants waiting for me to explore in this world. Therefore, I must study hard and study hard.