Transpiration is the loss of the water vapour from the surface of the leaves by evaporation.
Water can't evaporate into water or into high humidity. If the water can't leave the plant, then the transpiration stream stops and the plant won't be able to transporate mineral ions to the leaves.
Many plants contain specialised structures at the tips or margins of their leaves called hydathodes.
Hydathodes can release water droplets which can then evaporate from the leaf surface.
Comments
No comments have yet been made