heliotropism

Sunflowers always turn with the sun because of their heliotropism.

向日葵的向光性使它总是随着太阳的方向而移动。

Heliotropism A form of phototropism in which flowers move to point toward the sun, tracking it as it moves across the sky.

向日性：趋光性的一种类型，植物的花在一天内朝向太阳，并随着日光照射的方向而转移方位。

Recent explanations for heliotropism of sunflower

葵花向阳原因新解析

negative heliotropism

背日性 负向日性

positive heliotropism

正向日性

Flower heliotropism

花向日性

heliotropism

n. 向日性, 屈日性

transverse heliotropism

横向日性