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Fav十万个为什么
果实成熟后为什么会从树上掉下来？
果实成熟后会从树上掉下来，主要是由于重力作用、果柄细胞衰老以及果实与树枝的连接减弱，具体如下：
1、重力作用：随着果实的成熟，其重量不断增加。当果实的重量超过果柄的支撑能力时，重力作用会使果实从树上掉落。
2、果柄细胞衰老：果实成熟过程中，果柄部位的细胞会逐渐衰老，细胞壁失去弹性和结构的紧密性降低，导致果柄变得脆弱，容易断裂。
3、果实与树枝的连接减弱：在果实成熟过程中，果柄与树枝连接处的细胞会分泌离层酸等物质，促使细胞壁分解，形成离层。这使得果实与树枝的连接逐渐减弱，最终导致果实脱落。
总结：果实成熟后会从树上掉下来，主要是由于重力作用、果柄细胞衰老以及果实与树枝的连接减弱共同作用的结果。
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