2+-+Transpiration

=Transpiration= Transpiration happens when water enter plants through the roots, moves up into the plants, and then exits by changing into water vapor and evaporating through the leaves. Most of the water taken up by plants is released through transpiration. Once the water vapor evaporates into the air it is stored in the atmosphere until it becomes clouds or precipitation. Transpiration helps keep plants cool the same way sweating keeps people and animals cool.

The amount of water lost by plants depends on its size, the intensity of light, temperature, humidity, and wind speed. The supply of water in the soil and the soil temperature can also affect the rate of transpiration. For example, a fully grown tree may lose hundreds of gallons of water through its leaves on a hot, dry day.