Joke Collection Website - Cold jokes - A problem that has puzzled me for many years, sunflowers follow the sun and turn from east to west. The next day, did you go back to the east and continue to turn?
A problem that has puzzled me for many years, sunflowers follow the sun and turn from east to west. The next day, did you go back to the east and continue to turn?
Sunflower is really sunny from germination to disk flowering. During the day, its leaves and disk follow the sun from east to west, but not immediately. Botanists have measured that its disk direction is about 12 degrees behind the sun, which is 48 minutes. After the sun goes down, the sunflower tray slowly swings back, facing east at about 3 am, waiting for the sun to rise.
Under the irradiation of sunlight, the auxin content on the back of sunflower increases, which stimulates the cells on the back to elongate, thus slowly rotating towards the sun. After the sun goes down, auxin is redistributed, and the sunflower slowly turns back to its original position, that is, the east.
However, once the disc is in full bloom, it no longer turns to the sun, but is fixed in the east. Why should we finally face the east instead of the other direction or upward? This may be the result of natural selection, which is beneficial to the reproduction of sunflower. Sunflower pollen is afraid of high temperature. If the temperature is higher than 30℃, it will be burned. So you can avoid direct sunlight at noon and reduce radiation. In the early morning sunshine, the flower tray helps to dry the dew condensed at night and reduce the possibility of being attacked by mold. Moreover, in the cold morning, under the sunshine, the sunflower disk becomes a warm nest, which can attract insects to stay there to help pollinate.
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