神奇的植物开花“生物钟”

植物图片 2020-03-21 15:39

著名植物学家林奈，经过对植物的开花时间的多年研究之后发现，每种花开放的时间基本上是固定的；他把这些开花时间不同的花卉种在大花坛里，制成了一个“报时钟”。依据“报时钟”里种植在哪个位置的植物花开了，就可大致知道当时的时间。

植物开花生物钟

蛇麻花约在凌晨3点开，

牵牛花约在4点开，

野蔷薇约在5点开，

芍药花约在7点开，

半支莲约在10点开，

鹅鸟花约在12点开，

万寿菊约在下午3点开，

紫茉莉约在下午5点开，

烟草花约在傍晚6点开，

丝瓜花约在晚上7点开，

昙花约在晚上9点开。

为什么各种植物都有自己特定的开花时间，而且固定不变呢？这是植物在长期的自然选择作用下形成的，以利于植物自己的生存。科学家研究发现，这种现象是由遗传基团控制的，代代相传就形成一种习性。

专题： 开花 生物钟 神奇
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