phototropism thigmotropism

What Is Phototropism Geotropism Thigmotropism? Phototropism is a growth movement in response to a unidirectional light source. Geotropism (or gravitropism) is a growth movement in response to gravitational forces. Other tropisms include hydrotropism (responding to a water gradient) and thigmotropism (responding to a tactile stimulus) What is phototropism in thigmotropism? Phototropism is the directional growth