transverse geotropism横的向地性
lateral geotropism横向地性
positive geotropism[植] 正向地性
negative geotropism负向地性
lateral arm plate geotropism侧向地性
N（名词） the response of a plant part to the stimulus of gravity. Plant stems, which grow upwards irrespective of the position in which they are placed, show negative geotropism 向地性