USUALLY A PLANT, IN RESPONSE TO AN ENVIRONMENTAL STIMULUS.

TURNING OR GROWTH MOVEMENT BY A PLANT, FUNGUS, OR ANIMAL

CHEMO-TROPISM IS THE GROWTH OF ORGANISMS

PHOTOTROPISM IS THE GROWTH OF ORGANISMS IN RESPONSE TO LIGHT.

IS THE MOVEMENT OF A PLANT OR PLANT PART IN RESPONSE TO CHANGES IN TEMPERATURE.

HYDROTROPISM (HYDRO- "WATER"; TROPISM "INVOLUNTARY ORIENTATION BY AN ORGANISM,

IS A MOVEMENT IN WHICH A PLANT MOVES OR GROWS IN RESPONSE TO TOUCH OR CONTACT STIMULI.