Why do sunflowers follow the sun?
It is called photo tropism…it is most noticeable in sunflowers because they are so large: See the definition I have provided Phototropism was originally termed “heliotropism,” or a plant’s response to the sun. This definition changed when it was found that plant responded the same way to artificial light. Some of the first experiments on this subject were done by Darwin. He noticed that a plant with foil on its tip did not grow toward light, and concluded that something was blocking the normal reaction of the tip toward the sun. His experiments were continued by Boyson-Jenson, who later realized that the water-soluble nature of plants contributed to their phototropisms.
