There are  two cells A and B adjacent to each other. Cell A has  ${\mathrm{\psi }}_{\mathrm{s}}$of – 5 Pa and ${\mathrm{\psi }}_{\mathrm{p}}$ of 2Pa. Cell B has ${\mathrm{\psi }}_{\mathrm{s}}$of – 8 Pa and ${\mathrm{\psi }}_{\mathrm{p}}$ of 7 Pa. Then the movement of water would be

In terms of water potential water moves from a region of higher water potential to a region of lower water potential. The water potential (ψ) of cell A is ${\mathrm{\psi }}_{\mathrm{s} }+ {\mathrm{\psi }}_{\mathrm{p}}$ = - 5 + 2 = -3 Pa. The water potential of Cell B is – 8 + 7 = - 1 Pa. Cell A has less water potential than cell B. Hence water moves from Cell B to Cell A.