Tropism

By:Dillon.Gathright 2/6/14 7th period science Mrs.Mackey.

Tropism

The growth movement a living organism has toward an external stimulus.

Geotropism

The turning or growth movement of a living organism in response to gravity.

Hydrotropism

The growth or movement in a sessile organism toward or away from water, as of the roots of a plant.

Phototropism

The growth or movement of plants in response to light.

Thigmotropism

A movement in which a plant moves or grows in response to touch of contact stimuli.