Tropism
lexi pritchett-5th period-2/6/14
Geotropism
Is the growth of a plant or immovable animal in response to the force of gravity.
Hydrotropism
Growth or movement in a sessile organism toward or away from water, as of the roots of a plant.
Phototropism
Any postive or negative, movment of a part of a plant toward, or away from, light sources see helio tropism.