phototaxy
/ˈfoʊtoʊˌtæksi/
noun
- The movement of an organism or cell toward or away from a source of light.
- Many insects show phototaxy, flying toward streetlights at night.
- Scientists use phototaxy to study how simple creatures respond to light.
- Algae exhibit positive phototaxy by swimming toward the water's surface.
Synonyms