Do you think that osmosis occurs when a cell is in an isotonic solution?

It could be the movement of water (osmosis), or other "stuff" (diffusion). If a cell is placed in an isotonic solution, that means the amount of stuff inside the cell and outside the cell is equal. No diffusion or osmosis will occur.

Consequently, what happens to a cell in isotonic solution?

When two environments are isotonic, the total molar concentration of dissolved solutes is the same in both of them. When cells are in isotonic solution, movement of water out of the cell is exactly balanced by movement of water into the cell. A 0.9% solution of NaCl (saline) is isotonic to animal cells.

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