An investigation was done to find out how different treatments affect the permeability of the cell surface membranes and tonoplasts in beetroot cells. The vacuoles of beetroot cells contain a red pigment. This pigment cannot leave the cells because it is unable to diffuse through the tonoplasts or the cell surface membranes. $1\text{ cm}^3$ cubes were taken from beetroot tissue and rinsed under running water for 20 minutes to remove any pigment released from damaged cells. The cubes were then put into test-tubes containing different contents and left for five minutes before being observed. Which row gives a correct explanation for the observation recorded for one of the treatments?
Biology 9700 · AS & A Level · Movement into and out of cells