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Positive chemotaxis is movement toward the source of the chemical stimulus (along the chemical concentration gradient in air or water); negative chemotaxis is movement away from the source. The phenomenon is known to exist in a number of microorganisms and invertebrates.
Noun. 1. chemotaxis-movement by a cell or organism in reaction to a chemical stimulus. taxis-a locomotor response toward or away from an external stimulus by a motile (and usually simple) organism.negative chemotaxis-movement away from a chemical stimulus.positive chemotaxis-movement toward a chemical stimulus.hemotaxis. n. 1. (Microbiology) the movement of a microorganism or cell in response to a chemical stimulus. (Ëki moÊËtaek moÊËtÃ¦k, sÉªs ËkÉm-). oÊ. n