A Complete Collection of 100000 Whys
Fav十万个为什么
为什么秋天叶落纷纷？
1、秋天来临，日照时间缩短，植物接收到的光照减少，导致叶绿素分解，叶子的绿色逐渐消失。
2、随着温度下降，植物会减少水分和养分的运输，叶子中的水分和养分逐渐被回收，叶柄与树枝之间的连接变弱。
3、叶子变黄、变红是因为叶绿素分解后，叶子里原有的黄色和红色色素显现出来，这些色素在夏天被叶绿素遮盖。
4、风和雨也会加速叶子的脱落，强风会吹断叶柄，雨水会使叶子湿润、沉重，更容易脱落。
5、叶子的脱落是植物为了适应寒冷的冬季，减少水分蒸发和养分消耗的一种自我保护机制。
总之，秋天叶落纷纷是植物为了适应季节变化，通过减少水分和养分消耗、保护自身的一种自然现象。
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