Use DPD = OP − TP and Ψw = Ψs + Ψp with the right signs to predict which way water moves, read plasmolysis stages, and explain transpiration, stomatal movement, ascent of sap, guttation and wilting.
Unit 7 carries 6 of the 40 botany marks; with four chapters sharing them, this one averages one and a half (MEC publishes weights by unit, not by chapter). The MEC scope line: Diffusion, diffusion pressure and diffusion pressure deficit; Osmosis and its types; Plasmolysis; Osmotic pressure, osmotic potential, water potential, wall potential, turgor pressure and wall pressure; Transpiration; Ascent of sap; Absorption, imbibition, guttation and wilting. Three ways it is asked:
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