1. As early as the end of the 18th century, a reasonable explanation has been made for this problem. The reason for this is that the plant has phototropism and the natural response in the body.
2. Its main reason is the element in its own body - xanthoxygenin, which will make the sunflower rotate slowly and move towards the direction of the sun with the stimulation of the sun. Because there is no light side, the material density is relatively low, while the light side, the material density is relatively high, so when the sun rises from the East in the morning, it will gradually start to move, and when the sun sets in the evening, it will return to its original position. But usually, it will stop turning when it blooms, and the direction is always the direction of the rising sun
3. The cause of this phenomenon is also due to the gravity of the earth. After the sun sets, it becomes dark. Without light, the hormone in its body drops rapidly. The originally curved branches become upright, so as to return to the original for growth. In this way, they grow back again and again, following the direction of the sun to change their angles.
