What is a definition of transpiration?
1 )
the evaporation of water vapour from a leaf due to the diffusion of water from an area of low water potential to high water potential
the loss of water vapour from a plant to its environment by diffusion down a water potential gradient
3 )
the movement of water from root to leaf due to the adhesion of water molecules to one another
4 )
the uptake of water by plant roots by movement of water down a continuous water potential gradient from air to soil
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