If the membrane only allows osmosis to take place, the cell would shrink.
Osmosis is the thermal movement of water molecule (solvents) through a selectively permeable membrane (the cell membrane) from a region of low concentration of solute to a region of high concentration of solute.
When a cell contains 50% solute and 50% solvent is means it is isotonic.
When a solution surrounding a cell contains more solute (70%) and less solvent (30%) than the cell, it is said to be hypertonic.
Therefore when an isotonic cell is placed in a hypertonic solution, there would be movement of water molecules from the cell, which has low concentration of solute to the surrounding solution with high solute concentration.
Learn more here:
https://brainly.com/question/19164620