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冷门知识 | 丰富你的知识储备

为什么果实成熟后会掉下来?

09 Apr 2023

Description

关于万有引力的发现,有这么一个传说:有一天,牛顿正坐在苹果树下休息,忽然一个熟苹果掉下来,砸到他的头上,牛顿由此提出了万有引力定律。那么,为什么果实成熟后会掉下来呢?其实,牛顿已经帮我们解开了一半的答案。果实成熟后,如果不及时采摘,大都会自行脱落,这并不是因为果柄太细,不堪果实的重负,而是因为果实必须落到地上,才能发芽生根,长出新的果树来。为了繁殖后代,当果实成熟时,果柄上的细胞就开始衰老,在果柄与树枝相连的地方形成一层所谓“离层”。离层如一道屏障,隔断果树对果实的营养供应。最后,由于地心的吸引力,果实纷纷落地。

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