*The growth of a plant toward any stimulus is called tropism, and the growth of a plant toward a light stimulus is called phototropism.
*The growth of the parts of plants in response to the force of gravity is called
*The growth or turning of plant roots towards or away from moisture is called Hydrotropism
*Chemo-tropism is the growth of organisms (or parts of an
organism, including individual cells) such as bacteria and plants,
navigated by chemical stimulus from outside of the organism or organisms