Sunflowers don t have eyes, so why do they stare at the sun?

At the base of the flower disc of sunflowers, auxin is basically equal in the sunny and dorsal directions. Obviously, sunflower sunshine is not phyto-auxin at work. So, what makes sunflowers turn to the sun?

Someone did an experiment in a greenhouse to use cold light (i.e., fluorescent lamps) instead of sunlight to simulate the direction of sunlight to irradiate sunflower discs. Despite the morning from the east and the evening from the west, the sunflower never turned. However, if you use a brazier instead of the sun and block out the light of the fire, the flower plate will be unusual, turning towards the brazier day and night, east and west, north and south.

It can be seen that the rotation of the sunflower flower disc is not due to the direct influence of light, but because the sunlight heats the tubular florets in the sunflower flower disc, and the fibers at the base will shrink, and this contraction makes the flower disc actively change direction to receive sunlight. Therefore, sunflowers can also be called "hot sunflowers".

Photosynthesis, the result of the development of the sun.

It doesn't matter, people don't dare to look at the sun even if they have eyes, how dazzling.

1It smiles and sways to the wind, it releases enthusiasm to the rain, it gives gratitude to the soil, it is a flower that never withers.

2I ran to the wind, shouted to the sun, and strutted to the place where my heart longed for the most.

3 I went to the forest, and said hello to the birds, to the trees, to the grass.

Hello answer, glad to answer for you. The reason why sunflowers rotate with the sun, as if they always face the sun, is actually because there is auxin under the flower plate, which can promote 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.

Hello, glad to answer for you. The reason why sunflowers rotate with the sun, as if they always face the sun, is actually because there is auxin under the flower plate, which can promote 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.

To put it simply, because the plant contains a special plant auxin, this substance will be distributed in various places of the plant with the influence of light, and transported from the bottom to the top, when the concentration on the sunny side is very low, the concentration on the backlit side will be relatively high, so the backlit side grows quickly, the fast-growing side is high, and the slow side is low, just like the sunflower bends towards the sun.

Why do sunflowers always face the sun?

Why do sunflowers always face the sun? Star Awareness Project