Motile organisms may also be negatively chemotactic, swimming away from concentrations of toxic chemicals.可以游动的生物体也有负向的趋化现象，总是远离有害的化学物质。
The spermatozoids of primitive plants are often positively chemotactic, swimming toward the female organs in response to a chemical secreted by the latter.较原始的植物的游动精子有正向的趋化现象，总是游向由雌性器官所分泌的物质。
