n. 【生物学】向地性。 negative geotropism负向地性，背地性。 positive geotropism正向地性。
an orienting response to gravity
例句与用法
1.
The main stems of a plant show negative geotropism as they grow upwards . 植物茎往上长时表现出负向地性。
2.
An auxin increases the growth in length of a plant cell, thus causing the curving of a stem, or roof, in phototropism and geotropism . 植物生长素能加快植物细胞长势，因此使茎弯曲向着阳光，或使根深扎入土。
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