phototropism
/ˌfoʊtəˈtroʊpɪzəm/
noun
- The growth or movement of a plant or other organism in response to light, especially toward or away from it.
- The scientist studied phototropism in seedlings to understand how they find light in dark soil.
- Sunflowers exhibit strong phototropism, turning their heads to follow the sun across the sky.
- Houseplants on a windowsill often lean toward the glass because of phototropism.