Positive tropism: growth towards direction of stimulus
Negative tropism: growth away from stimulus
Geotropism: plant response to gravity
Phototropism: plant response to light
chemotropism: plant response to chemical
Hydrotropism: plant respose to water
Thigmotropism:plant response to touch
Photonasty: plant response to light
Seismonasty: plant response to mechanical stimulus
Thermonasty: plant response to changes in temperature
Thigmonasty: plant response to vibration
Nyctinasty: a circadian rhythm that responds towards the onset of darkness
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