phototaxis

views updated Jun 11 2018

phototaxis A change in direction of locomotion in a motile organism or cell that is made in response to a change in light intensity. The response is related to the direction of the light source. Compare PHOTOKINESIS.

A Dictionary of Zoology MICHAEL ALLABY

phototaxis

views updated May 29 2018

phototaxis A change in direction of locomotion in a motile organism or cell which is made in response to a change in light intensity. The response is related to the direction of the light source. Compare photokinesis.

A Dictionary of Ecology MICHAEL ALLABY

phototaxis

views updated May 21 2018

phototaxis The movement of a cell (e.g. a gamete) or a unicellular organism in response to light. For example, certain algae (e.g. Chlamydomonas) can perceive light by means of a sensitive eyespot and move to regions of higher light concentration to enhance photosynthesis. See taxis.

A Dictionary of Biology

phototaxis

views updated May 23 2018

phototaxis A change in direction of locomotion in a motile organism or cell made in response to a change in light intensity.

A Dictionary of Plant Sciences MICHAEL ALLABY

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Phototaxis

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