For evaporation to occur there must be heat
the heat is from sunlight (light energy to heat energy)
tthe leaf is warmed by sunlight
evaporation occurs (where the water changes from liquid to gas state) in the spongey mesophile.
diffusion of water vapour through the stomatal pore to the outside atmosphere through a steep diffusion gradient.
its better to say that the sunlight energy is ocnverted to heat and that this causes the phase change of liquid water to the vapour phase.
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