睡莲花有生物钟吗？ 睡莲为什么在早上7点开花
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睡莲每天早迎朝气，晚辞霞光，开而又合，合而又开。睡莲为何朝开暮合呢
原来是清晨初升的太阳把睡莲从睡梦中唤醒，莲花外边受到阳光照射，生长变慢，内层背阳，就迅速伸展，使花儿绽开。到下午时，呈圆盘状的花朵内层受到阳光的照射，外层背阳，于是又自动地闭合起来。睡莲正是按照“日出而作，日落而息”的规律生活的。
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