Why Do Leaves Fall in the Cold Season?

many trees begin to lose their leaves in au- W= and become totally leafless in winter. Why does this always happen? Leaves have countless stomas, through which a large amount of moisture evaporates into the air. In a warm climate, with plenty of rain, trees can maintain enough moisture while in autumn things are quite different. When the cold weather comes, without much rain, it makes the earth dry too. As roots supply less moisture, leaves begin to fall. Without leaves moisture cannot evaporate quickly, thus ,,can survive the winter.