Which one among the following has negligible role in

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Which one among the following has negligible role in evapotranspiration?

Radiation intensity
Atmospheric dew point
Atmospheric pressure
Length of day
This question was previously asked in
UPSC Geoscientist – 2021
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Atmospheric pressure has a negligible role in evapotranspiration compared to factors like radiation intensity, atmospheric dew point, temperature, wind, and soil moisture.
Evapotranspiration is the combined process of evaporation (water from surfaces like soil and water bodies) and transpiration (water from plants) into the atmosphere. It is primarily driven by the energy available (radiation), the difference in water vapor concentration between the surface and the atmosphere (humidity/dew point), and the movement of air (wind).
While pressure can affect the density of air and thus the diffusion rate of water vapor, its variations under normal atmospheric conditions have a far less significant impact on the overall rate of evapotranspiration compared to changes in temperature, radiation, humidity, or wind speed.

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