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词汇 heliotropism
释义
heliotropism
noun [ U ] biology specialized /ˌhiː.liˈɒt.trə.pɪ.zəm/ /ˈhiː.li.ə.troʊ.pɪ.zəm/
向日性
the growth or movement of a plant, or of a particular part of a plant, towards the sun or away from it
Sunflowers in the bud stage exhibit heliotropism. 含苞待放的向日葵表现出向日性。
Heliotropism is like a plant sense; the way that a plant senses the sun and grows toward it.
    更多例句
  • Geotropism and heliotropism cause roots to strike into the earth and leaves to turn to the light.
  • He has performed experiments in heliotropism, clearly establishing the power of light in lower forms of organisms.
  • Where a plant exhibits positive heliotropism, the part away from the light attains a greater length than that towards it.
Compare: geotropism
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