write definition of 1.Hydrotropism 2.Geotropism 3.Chemotropism
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hydrotropism. noun. Growth or movement in a sessile organism toward or away from water, as of the roots of a plant. Related Forms: hy′dro·tro′pic.
geotropism. The directional growth of an organism in response to gravity. Roots display positive geotropism when they grow downwards, while shoots display negative geotropism when they grow upwards.
Chemotropism is defined as the growth of organisms navigated by chemical stimulus from outside of the organism.A chemical gradient can influence the growth of the organism in a positive or negative way.
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