15 Differences between Transpiration and Evaporation

Transpiration

Evaporation
It is a physiological process that occurs in plants. It is a physical process and occurs on any free surface.
Transpiration is a slow process. Comparatively a fast process.
Living cells are involved. It can occur from both living and non-living surfaces.
In Transpiration the water moves through the epidermis with its cuticle or through the stomata. Any liquid can evaporate. The living epidermis and stomata are not involved.
Various forces such as vapor pressure, osmotic pressure, etc. are involved. Not many forces are involved.
Occurs during the daytime. Occurs during day as well as night
Formation of vapors continues for some time even after the saturation of outside air. Evaporation stops when the air is fully saturated
Water vapors are formed mostly in internal tissues of the plant. Water vapors are formed at the free surface of water
The rate of transpiration is slightly lower than evaporation under the influence of wind velocity because it lowers the leaf temperature. It varies directly according to the velocity of wind.
It is largely dependent upon absorption of water from the soil. It continues as long as water is available on the surface.
Transpiration is controlled by osmotic potential and water potential. There is no such regulations or control over the Evaporation.Evaporation is independent of these processes
It helps in the uptake of minerals and nutrients. It is not associated with minerals or nutrients uptake
Surface remains wet Surface becomes dry
Transpiration makes the surface of leaves and young stems wet and protects them from sunburn. Evaporation provides dryness to the free surface
CO₂, pH value and hormones impact transpiration.

These cannot impact upon evaporation.

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