heliotropism
/ˌhiːliˈɑːtrəˌpɪzəm/
noun
- The growth or movement of a plant toward or away from sunlight.
- Heliotropism helps plants maximize their energy from sunlight.
- The scientist studied heliotropism in bean seedlings.
- Sunflowers are famous for their heliotropism, turning to face the sun.
Synonyms