AP BIOLOGY

Detailed explanation-1: -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-2: -Cell shape and size remain the same when the solution outside is isotonic. The cell shrinks and loses shape when the solution outside is hypertonic. The cell enlarges when the solution outside is hypotonic.

Detailed explanation-3: -iii) The size of the cell remains the same when placed in an isotonic solution. This is because both the inside and outside of the cell are in the same concentration with respect to water and solutes Hence, there there will be no net movement of water.

Detailed explanation-4: -Cells in an isotonic solution retain their shape. Cells in a hypotonic solution swell as water enters the cell, and may burst if the concentration gradient is large enough between the inside and outside of the cell. Cells in a hypertonic solution shrink as water exits the cell, becoming shriveled.

Detailed explanation-5: -An isotonic solution is one that has the same osmolarity, or solute concentration, as another solution. If these two solutions are separated by a semipermeable membrane, water will flow in equal parts out of each solution and into the other.