Why do sunflowers face the sun? Why do sunflowers face the sun?

People have long discovered that sunflowers are always turning around in front of the sun all day long, why is that?

It turns out that plants have a substance called auxin, which can make plants grow tall and big, but they are timid and afraid of sunlight. Therefore, when the growth hormone on the neck of the sunflower sees sunlight, it runs to the side of the backlight to avoid it, but the growth hormone on the backlit side increases, and they cause this side to grow very fast, while the sunny side grows slower, so the plant bends to the side with light. As the sun moves in the sky, auxin is constantly moving against the sun's back, like "hide and seek".

As a result, we often see sunflower discs that are always facing the sun, turning from east to west every day.

During the period from bud to bloom, the sunflower follows the sun from east to west during the day. However, it was not an immediate follow-up, as botanists measured that the orientation of the flower disc was about 12 degrees behind the Sun, or 48 minutes. After the sun goes down, the sunflower disc slowly swings back again, and at about 3 a.m., it faces east and waits for the sun to rise.

However, once the flower disc is in full bloom, it no longer rotates towards the sun, but is fixed towards the east.

He also had to see what time it was, and when the sun went down, he lowered his head and went to sleep.

Plants have a substance called auxin, which can make plants grow tall and big, but they are timid and afraid of sunlight, so when the growth hormone on the neck of the sunflower sees the sun, it runs to the side of the backlight to avoid it, but the growth hormone on the backlit side is more and more, and they cause this side to grow very fast, while the sunny side grows slower, so the plant bends to the bright side. As the sun moves in the sky, auxin is constantly moving against the sun's back, like "hide and seek". As a result, we often see sunflower discs that are always facing the sun, turning from east to west every day, and so on.

So, in addition to sunflowers, there are many kinds of plants whose flowers or leaves can also grow towards the sun, is it also because auxin is afraid of light? No, they grow to the sun in order to get more sunlight and produce more nutrients so that they can grow better.

Because the auxin is backlit on the receptacle of sunflowers, the stems on the backlit side grow faster, and the stems bend towards the light source.

Not necessarily? Some are not.