“向地性”造句

植物茎往上长时表现出负向地性.
The main stems of a plant show negative geotropism as they grow upwards.

根系向地性变化可由缺磷等因素所诱导, 且存在著一定的遗传变异性.
Root gravitropic responses are adaptive , inheritable traits induced by low phosphorus availability and other factors.