Taxis
Directed movement of a motile cell or organism in response to an external stimulus / From Wikipedia, the free encyclopedia
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This article is about the behavioural response. For the vehicle, see Taxi. For other uses, see Taxi (disambiguation) and Taxonomy.
"Thigmotactic" redirects here. For the Negativland album, see Thigmotactic (album).
A taxis (from Ancient Greek τάξις (táxis) 'arrangement, order';[1] pl.: taxes /ˈtæksiːz/)[2][3][4] is the movement of an organism in response to a stimulus such as light or the presence of food. Taxes are innate behavioural responses. A taxis differs from a tropism (turning response, often growth towards or away from a stimulus) in that in the case of taxis, the organism has motility and demonstrates guided movement towards or away from the stimulus source.[5][6] It is sometimes distinguished from a kinesis, a non-directional change in activity in response to a stimulus.