taxis

A taxis (from Ancient Greek τάξις (táxis) 'arrangement, order'; pl.: taxes ) 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. It is sometimes distinguished from a kinesis, a non-directional change in activity in response to a stimulus. Taxis can be positive (moving towards the stimulus) or negative (moving away from the stimulus).

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