How can you prove that plant leaves evaporate water? what is the importance of water evaporation in plant life

In order to prove that plants evaporate water, you need to take a plastic bag, cover a plant or a tree branch with it, tie it and wait for several hours. After a while, water droplets will appear on the walls of the bag, which you can even drink. Thus, when water evaporates, it protects the plant from overheating, makes room for the entry of new minerals, which the plant absorbs by the roots along with water.