Question

If a cell is placed in a sugar solution, then in which condition, movement of water occurs in both directions across the cell membrane?

• A. When the cell is placed in an isotonic solution
• B. When the cell is placed in an hypotonic solution
• C. When the cell is placed in either an isotonic, hypotonic or hypertonic solution
• D. When the cell is placed in both isotonic and hypotonic

Answer 1

The correct option is C

When the cell is placed in either an isotonic, hypotonic or hypertonic solution

On placing a cell in isotonic, hypotonic or hypertonic solution, the movement of water occurs in both the directions that is from inside the cell to outside as well as from outside the cell to inside. However, the amount of water crossing the membrane from both sides varies. In an isotonic solution, the amount going in is the same as the amount going out. In a hypotonic solution, more water comes into the cell than leaves it while in a hypertonic solution more water leaves the cell than enters into it.