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Geotropism is a bending, turning or growth movement by a plant in response to gravity.
The process by which a plant bending towards the source of light on account of the movement of curvature is known as Phototropism.
Chemotropism can be defined as the growth or movement of a plant or plant part in response to or towards a chemical stimulus.
Thigmotropism is a movement in which a plant moves or grows in response to touch or contact stimuli.
 Hydrotropism is a plant's growth response in which the direction of growth is determined by a stimulus or gradient in water concentration. Hydrotropism can also be regarded as a growth or movement in a sessile organism toward or away from water, as of the roots of a plant.

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