Calculate water potential of solution which is enclosed in a semipermeable membrane whose Osmotic Potential is –35 bar and Pressure Potential is -5 bar.

The difference in the free energy of water molecules in a system and that of the water molecules in the pure water, when both temperature and pressure are kept the same is called water potential. The water potential of a cell is affected by both solute and pressure potential. Hence, water potential, Ψw = Ψs + Ψp Here, Ψs = -35 bar Ψp = -5 bar So, Ψw = -35 + -5 = -40

Write the relation between Diffusion Pressure Deficit (DPD), Osmotic Pressure(OP), and Turgor Pressure(TP).

The difference in the diffusion pressure of solution in comparison to the pure solvent is called the diffusion pressure deficit (DPD). It shows the capacity of the solution to absorb the water. Due to this, DPD is called suction pressure. The value of DPD is calculated as the algebraic difference between osmotic pressure (OP) and turgor pressure (TP). Thus, DPD = OP -TP