Which processes are involved in transpiration?
1 the diffusion of water vapour from stomata
2 the mass flow of water through the xylem
3 the evaporation of water from the surface of mesophyll cells
4 the evaporation of water vapour from air spaces
1, 2 and 3
2 )
2, 3 and 4
3 )
1 and 3 only
4 )
1 and 4
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