In eukaryote cells, it occurs in the mitochondria or chloroplasts. In prokaryote cells, it occurs in the cell membrane.
As a source of Cellular respiration .......
The most important function of osmosis is stabilising the internal environment of an organism by keeping the water and intercellular fluids levels balanced. In all living organisms, nutrients and minerals make their way to the cells because of osmosis. This obviously is essential to the survival of a cell.