~ the response by plants to stimuli is called TROPISM.
~there are 2 types : (a) POSITIVE tropism - response by plants ToWaRdS the stimulus.
(b) NEGATIVE tropism - response by plants AwAy from the stimulus.
1. PHOTOtropism - light
2. GEOtropism - gravity
3. HYDROtropism - water
4. THIGMOtropism - touch
5.NASTIC MOVEMENT - touch
~e.g. mimosa plant