Responses to the Environment

AP Biology· difficulty 3/5

The behavior shown by pillbugs in the choice chamber - moving toward higher humidity - is being identified.

Which term best describes this behavior?

  • A

    Phototaxis

  • B

    Negative geotaxis

  • C

    Chemotaxis

  • D

    Positive hydrotaxis (or kinesis)

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Explanation

Movement toward humidity/water is hydrotaxis (or hydrokinesis if the animal simply slows in moist conditions and accumulates there). Either describes the moisture-seeking behavior demonstrated.

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