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为什么花瓣都是五瓣的呢？

花瓣的数量和形态是由植物基因决定的。在植物进化的过程中，有些物种的花瓣数量逐渐固定为五瓣，因为这个数量适中，有利于花朵吸引传粉媒介。五瓣花的形态也具有对称美，更容易吸引昆虫、鸟类等传粉媒介的注意。

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