What type of solutions have the same osmotic pressure?

Isotonic solutions are those that have the same osmotic pressure, meaning that the concentration of solutes is equal on both sides of a semipermeable membrane. This equivalency allows for an equilibrium, where water molecules move in and out of the cell at an equal rate, preventing net movement in either direction. As a result, cells maintain their normal shape and function when they are placed in isotonic solutions.

In contrast, hypertonic solutions have a higher concentration of solutes compared to the inside of the cell, which causes water to move out of the cell and can lead to cell shrinkage or crenation. Hypotonic solutions contain a lower concentration of solutes, leading to an influx of water into the cell, which may cause the cell to swell and potentially burst. Concentrated solutions refer to solutions that contain a large amount of solute relative to solvent, but without specification as to whether they are hypertonic, isotonic, or hypotonic, they cannot be used to classify osmotic pressure accurately. Thus, isotonic solutions distinctly maintain the same osmotic pressure, making them the correct choice.