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为什么绿叶会变黄？

绿叶变黄是由于叶片内的叶绿素分解导致的。当叶片老化或受到压力、病虫害等外部因素影响时，叶绿素会逐渐分解，导致叶片由绿色变为黄色。这是植物进行生理调节的一种反应，也可以是植物凋零的信号。

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