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Plant respone, directed movement of an organ or organism in response to…

- - - - Gravitropism
        Gravitropism is growth in response to gravity. Gravitropism is very important in plants as it directs root growth toward the pull of gravity and stem growth in the opposite direction. The orientation of a plant's root and shoot system to gravity can be observed in the stages of germination in a seedling. As the embryonic root emerges from the seed, it grows downward in the direction of gravity. Should the seed be turned in such a way that the root points upward away from the soil, the root will curve and reorient itself back toward the direction of the gravitational pull.
- - - - Thigmonasty
        
        Thigmonasty movement
        The non-directional movement of a plant in response to the contact of an object is called Thigmonasty movement. In the insectivorous plant’s leaves like Drosera, Dionaea the tentacles show variation in movements on coming in contact with an insect. The stimulus touch of an insect is transmitted to the entire leaf and all the tentacles bend over the insect.
        
        Hyponasty
        a nastic movement in which a plant part is bent inward and upward
        
        Epinasty
        nastic movement in which a plant part (such as a flower petal) is bent outward and often downward