The statements given below are incorrect. Rewrite the correct statement by changing the underlined words of the statements:
Free movement of solutes in and out of the cell takes place across the CELL MEMBRANE.
Topic: Cell wall
Answer
Free movement of solutes in and out of the cell takes place across the CELL WALL.
The word FREE is what decides this, and it is a distinction examined repeatedly: the CELL WALL is FREELY PERMEABLE — it lets everything through, solutes included the CELL MEMBRANE (plasma membrane) is SELECTIVELY PERMEABLE — it controls what enters and leaves
THE PROOF is the plasmolysed cell: the gap between the shrunken protoplasm and the wall is filled with the external HYPERTONIC SOLUTION, which passed straight through the wall and was stopped only at the membrane.
That is also why OSMOSIS is defined as requiring a selectively permeable membrane — without selectivity there would be no osmosis, only diffusion.