Why did the number of water molecules on each side of the membrane change, whereas the number of sugar molecules stayed the same? **Osmosis Educational Diagram Explanation****U-Tube Illustration:**- **Before Osmosis:** The U-tube diagram shows two columns separated by a selectively permeable membrane. One side contains a solution with sugar molecules, represented by larger black dots, and water molecules, represented by smaller white dots.- **After Osmosis:** The diagram shows the outcome after osmosis. The water level on the side with more sugar molecules is higher, illustrating how water moves through the selectively permeable membrane towards the higher concentration of solute.**Selective Permeable Membrane Inset:**- An enlarged view demonstrates how water molecules can pass through the membrane, while larger sugar molecules cannot.**Cell Environment Diagrams:**- **Cell in Isotonic Solution:** Both water molecules and dissolved particles are shown inside and outside the cell. Water moves into and out of the cell at the same rate, resulting in no net movement of water.- **Cell in Hypotonic Solution:** The environment outside the cell has fewer dissolved particles than inside. Water enters the cell by osmosis, which can cause the cell to swell.- **Cell in Hypertonic Solution:** The environment outside the cell has more dissolved particles than inside. Water leaves the cell by osmosis, leading to cell shrinkage.**Note:** The diagrams and processes explained are fundamental in understanding osmotic pressure and its effects on cells in various solutions. Make sure to refer to these illustrations for a clearer comprehension of osmotic behavior.

Osmosis is a process in which the solvent molecules in a solution goes from a region of low concentration to a solution of high concentration via a semi-permeable membrane. In the U - shaped tube,we can see that there is a selective permeable membrane at the bottom which allows only certain size of molecule to pass through. So, when there is an imbalance of concentration across the membrane water tries to balance it out by moving from region of high water(solvent) low solute to the region of low water, high solute region as the solute can't pass through the semi-permeable membrane. Therefore, the number of water molecules on each side of the membrane change, whereas the number of sugar molecules stayed the same.