The Bowen ratio is defined as :

1.	The Bowen ratio is defined as :
A.	Ratio of heat and vapour diffusivities.
B.	Proportionality constant between vapour heat flux and sensible heat flux.
C.	Ratio of actual evapotranspiration and potential evapotranspiration.
D.	Proportionality constant between heat energy used up in evaporation and the bulk radiation from a water body.
Answer» E.

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The Bowen ratio is defined as :

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