photokinesis
/ˌfəʊtəʊkɪˈniːsɪs/ /ˌfəʊtəʊkʌɪˈniːsɪs/Biology
noun
Change in the degree of activity of an organism in response to light; a light-induced kinesis.
Origin
Early 20th century; earliest use found in Journal of Comparative Neurology. From photo- + kinesis, after German Photokinese.