01 n. The influence of light on the movements of low organisms, as various infusorians, the zoospores of certain algæ, etc.; also, the tendency t…
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The influence of light on the movements of low organisms, as various infusorians, the zoospores of certain algæ, etc.; also, the tendency to follow definite directions of motion or assume definite positions under such influence. If the migration is toward the source of light, it is termed positive phototaxis; if away from the light, negative phototaxis.(Biol.)