transpiration pull

Question 1

what are the steps of transpiration pull?

Answer 1

1. water molecules move via osmosis continuously out of mesophyll cells to form a thin film of water of cell wall surfaces
2. this thin film of water evaporates to form water vapour in the intercellular air spaces, resulting in a higher concentration of water vapour
3. water vapour diffuses through the stomata into atmospheric air with lower concentration of water vapour
4. the water potential of cell sap becomes more negative since water moves out to transpire. water molecules move via osmosis from the xylem of the leaf into mesophyll cells