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kind of sexual movement. It is the directional motion caused by plant gravity. Positive and negative ground. The direction of reaction is called positive groundness toward gravity, such as roots always growing downwards, and negative gravity, which is opposite to gravity, such as stems growing upward, or rice and wheat falling, can be erected upright. With regard to the causes of geogenicity, it is generally believed that due to gravity caused by uneven distribution of growth hormone. When the stem is flat, more growth hormone moves to the side of the ground, so the cells on this side grow fast, and the stem manifests it as negative ground. In the root, growth hormone distribution although this is also the case, but the root is sensitive to growth hormone, trace growth is known to promote growth, and when the growth hormone content is slightly more, the growth of the root is inhibited, so the growth of the upper cells with low growth hormone content is fast, so that the root growth down, as a positive ground.
