Why do sunflower flowers rotate with the sun?

Sunflower auxin.

It forms mainly at the tip of the stem and is transported towards the base. The distribution of auxin is affected by light. Auxin prefers shady places.

Therefore, the side of the sunflower stem that carries the sun on its back has more auxin, and it grows fast, and the sunflower flower disc is facing the sun. I went to look at the sunflowers again, and sure enough, I saw that the stems of the sunflowers were growing long on the side of the sun. But I have another question:

Since the sunflower's flower plate follows the sun, when it comes to sunset, it faces west. So, how could it be facing east at sunrise the next day? I consulted with my science teacher, and it became clear to me that sunflowers slowly turn straight at night after the sun sets, and before the sun comes out in the early hours of the next morning, they begin to slowly turn to the east to meet the rising sun.

I also learned from my science teacher that sunflower seedlings, stems, leaves, and flower disks will rotate with the sun, and that sunflowers photosynthesize in the stalks of plants until the flower disk sets seeds.

The product accelerates to the flower disc concentration, the stalk becomes rough and hard, the leaves turn yellow, chlorophyll.

Fade away, photosynthesis tends to stop, and the flower disc is fixed towards the east and no longer rotates with the daylight.

Sunflowers rotate with the sun, why do sunflowers have this habit? There are always some magical animals and plants in the wonderful nature, some of their naturally occurring behaviors are difficult to be understood, and they always seem so magical and interesting, but in fact, behind these magical behaviors, there are always some intriguing scientific truths contained in them. Sunflower is a common planting crop in nature, and its behavior of following the sun and turning to the sun is very magical, so why do sunflowers open to the sun, and they also follow the sun, the reason behind this is very interesting!

Early scientists found that sunflowers will follow the sun, through research scientists found that the behavior of sunflowers is mainly related to auxin, auxin can be simply understood as a hormone that promotes growth and development, it can promote plant growth, but auxin has a characteristic called lightproof, it is especially like a naughty child playing hide and seek with people, as long as the light is where it will leave and flee in the opposite direction.

It is precisely because of the "interesting character" of auxin that there will always be more auxin in the backlit part of the "body", so that part of the "body" will grow in a hurry, in this case, there will be a phenomenon that the backlight part grows faster and the light part grows slower, and under the uncoordinated growth rate of one fast and one slow, the sunflower will bend, and it looks like the sunflower is spinning towards the sun.

However, the sunflower will bloom towards the sun, and the reason behind this is a bit magical, because around the sunflower flower plate, there are some flowers that look like leaves, and it has a nice name called tongue florets, and the small flowers attached to the sunflower seeds in the middle are called tubular florets. Tubular florets are rich in fibers, but the fibers in this tubular florets have a characteristic, the temperature of the tubular florets will increase under sunlight, and then the fibers inside the florets will undergo a change, and those fibers at the base will shrink after the temperature rises, and when the fibers shrink, the flower disc will take the initiative to turn around to receive sunlight, so the sunflower flower disc will rotate and will open towards the sun.

In fact, this characteristic of sunflowers, in essence, is also a result of evolution, after all, we all know that the growth of plants depends largely on sunlight, and this characteristic of sunflowers can make itself have more time to receive sunlight in a day, so that the energy it absorbs will increase, and the growth rate will be faster.

Sunflowers rotate with the sun because of the auxin underneath the flower disc, which promotes the growth and reproduction of the plant. There is also the restriction of sunlight, and the stem will drag its flower disc and bend towards the side with the sun. When there is sunlight, sunflowers will rotate with the sun.

When the sun goes down, the auxin it contains is redistributed again, so it returns to its original position.

Because it doesn't bloom in shady places, the sun is always turning, and it can only bloom slowly by looking at the sun.

Because there is a plant hormone in the stem under the sunflower flower, light has an inhibitory effect on it, which makes the backlit side grow faster, which is why the sunflower has always been oriented to the light.

The distribution of sitin is affected by light.

Because sunflowers, sunflowers, must follow the sun