A Complete Collection of 100000 Whys
Fav十万个为什么
为什么秋天叶子会变黄？
1、秋天日照时间减少，植物体内的叶绿素合成减少，导致叶绿素分解速度加快，叶黄素等黄色色素显现出来。
2、叶绿素是绿色的，它负责吸收阳光进行光合作用，当叶绿素减少时，叶子的绿色就会减弱，黄色就显现出来。
3、温度下降会加速叶绿素的分解，因为低温会影响叶绿素的稳定性，使其更容易分解。
4、植物在秋天会停止生长，为了节省能量，会开始分解叶片中的叶绿素，将其中的一部分物质重新利用。
5、叶黄素原本就存在于叶片中，但在叶绿素存在时被掩盖，只有当叶绿素分解后，叶黄素才会显现出来。
总之，秋天叶子变黄是由于日照减少、叶绿素分解加速、温度下降、能量节省以及叶黄素显现等多种因素共同作用的结果。
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