Bending in reaction to some stimulus (e.g. growing towards the light is phototropism).
Orientation movement of a sessile organism in response to a stimulus. Movement of curvature due to an external stimulus that determines the direction of movement. Also known as topotaxis.
The automatic directing of an organism toward or away from a source of stimulus.
Growth patterns wherein plants turn or grow toward or away from a stimulus such as light (the Sun) or moisture.
The involuntary response of an organism as a bending, turning, or movement toward (positive tropism) or away from (negative tropism) an external stimulus such as light, heat, gravity, or various chemical changes.