向こう日じつ性せい

noun, noun which may take the genitive case particle 'no'

heliotropism; phototropism

Biological term for the tendency of plants or flowers to orient toward sunlight. Often used in botany and plant physiology.

See also: 背日性

• ヒマワリは向こう日じつ性せいの植しょく物ぶつとしてよく知しられている。

  Sunflowers are well known as heliotropic plants.