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geotropism n.【生物學】向地性。 negative geotrop...

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An auxin increases the growth in length of a plant cell, thus causing the curving of a stem, or roof, in phototropism and geotropism . 植物生長素能加快植物細胞長勢,因此使莖彎曲向著陽光,或使根深扎入土。

The main stems of a plant show negative geotropism as they grow upwards . 植物莖往上長時表現出負向地性。