1. of, relating to, or exhibiting phototaxis; moving in response to light
Usage: biology; technical

Examples

• Phototactic bacteria move toward or away from light sources.
• The phototactic response of algae helps them find optimal light conditions.
• Many aquatic organisms display phototactic behavior to locate food.
• Scientists study phototactic organisms to understand how cells sense light.
• The phototactic movement of flagellated protists is visible under a microscope.