What does the evaporation of water from leaves have for a plant?

The role of evaporation of water from leaves for a plant is very important. Lead in this way the plant with excess soil moisture removes excess moisture absorbed by the roots through the leaves. In the tropics, where there is always high humidity, the leaves of plants are usually large and thus they evaporate as much moisture as possible. In temperate climates, the humidity is not so high, and therefore the leaves of plants are smaller. In a dry desert, plants have either very small leaves or thorns so that moisture evaporates to a minimum.