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Osmosis in plant cells is very similar to osmosis in animal cells, except for on major difference.  Plant cells are contained by cell walls, which means that they do not share the same flexibility as animal cells.  When a plant cells is placed in a hypertonic solution, a solution with a great deal of solute, the water will leave the vacuole causing the cytoplasm to pull away from the cell walls.  If the plant cell is immersed in a hypotonic solution, water will go into the solute rich vacuole and casue the cell to push out against the ridgid cell wall.  Isotonic solutions that hold plant cells create an equilibrium in the water flowing in and out of the vacuole.