How does chemical coordination occur in plants?

Explanation

The plants do not have nervous system but they can still sense things. The plants can sense the presence of stimuli such as light, gravity, chemicals, water, and touch, etc., and respond to them by action of hormones. Thus, the plants coordinate their behaviour against environmental changes by using organic chemicals called hormones. This is called 'chemical' coordination'. The hormones in plants coordinate their behaviour by affecting the growth of a part of the plant resulting in the movement of that plant part in response to a stimulus. For example, when sunlight falls on a shoot from one side, the auxin hormone causes the shady side of shoot to grow faster, making the shoot bend towards sunlight.