AP BIOLOGY

Detailed explanation-1: -An isotonic solution is a solution in which the amount of dissolved material is equal both inside and outside of the cell.

Detailed explanation-2: -when both inside and outside of a cell have the same amount of water it is said that the cell has reached a state of equbilrium .

Detailed explanation-3: -If a cell is placed in an isotonic solution, there will be no net flow of water into or out of the cell, and the cell’s volume will remain stable. If the solute concentration outside the cell is the same as inside the cell, and the solutes cannot cross the membrane, then that solution is isotonic to the cell.

Detailed explanation-4: -Final answer: When the concentration of water and solutes on either side of the cell membrane is same, the solution is said to be isotonic.

Detailed explanation-5: -If the substance can cross the cell membrane, its particles will tend to move toward the area where it is less concentrated until equilibrium is reached. At that point, the concentration of the substance on both sides of the cell membrane will be the same.