Difference Between Transpiration and Evaporation

Difference Between Transpiration and Evaporation:

The following are the points of difference between Transpiration and Evaporation-

It is a physiological process.It is purely a physical process.
Transpiration is the loss of water from the surface of living cells.Evaporation is loss from the free surface of the water.
The influence of environmental conditions is modified by plant factors.It is purely controlled by environmental conditions.
Forces like vapour pressure, diffusion pressure, osmotic pressure control the process.Environmental factors like relative humidity and air current influence the process.
Anatomy of the transpiring organ is important in controlling transpiration.The internal structure of evaporating surface has little effect.
Transpiration can continue even when the air is saturated because transpiring organs have higher temperature and higher vapour pressure.It does not occur if the air is saturated with water vapours.
It is a slow process.Comparatively a fast process.
It initially increases with the increase in wind velocity but later begins to decline.It increases with the velocity of the wind.
It is regulated by the amount of soil water available to the plant.This is a continuous process, till water is present.
It makes the surface of leaves and young stems wet and protects them from sunburn.It provides dryness to the free surface.
CO2 concentration controls transpiration through its effect on the opening and closing of stomata.CO2 concentration has little effect on evaporation.
Light has a lot of effect on transpiration due to its heating effect and controlling the opening of stomata.Light has no influence on evaporation.

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