秋天到了,许多植物的叶子都变成了黄色,瑟瑟秋风一起,枯黄的树叶便悄然飘落。为什么树木在秋天会落叶呢? A:春夏季节,叶子通过叶柄牢固地长在树枝上。到了秋冬季节,雨水稀少,空气干燥,日照时间缩短,此时树叶中会产生一种 When the autumn is over, the leaves of many plants turn yellow, and with the autumn winds, the yellow leaves fall quietly. Why do trees fall in the fall? A: In spring and summer, the leaves grow firmly through the petiole on the branches. In autumn and winter, the rain is scarce, the air is dry, and the sunshine time is shortened. At this time, a kind of leaf will be produced