Taxis
A tactic response is the movement of an organism based on a stimulus.
Explanation:
The tactic response can be positive or negative based on the stimuli. In this case, it is negative because the response of the organism is moving where the stimuli (light in this case) is lowest. Tactic responses are different from tropic responses in that tactic responses are locomotory while tropic responses are growth-based. Tropic responses are also faster and temporary while the latter are slow and permanent.
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