E.3a Innate Behavior


  • locomotion of an organism
  • in a particular direction
  • in response to an external stimulus
  • examples:
    • Planaria moves towards food = positive chemotaxis
    • Euglena moves towards light = positive phototaxis


  • the movement (as opposed to growth) of an organism or a cell
  • in response to a stimulus
  • such that rate depends on intensity, but not direction, of the stimulus
  • example:
    • woodlice move about less in optimum, humid, conditions, and more in unfavorable, dry conditions

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