Osmosis | Definition| Easy to understand

osmosis, the spontaneous passage or diffusion of water or other solvents through a semipermeable membrane (one that blocks the passage of dissolved substances—i.e., solutes). The process, important in biology, was first thoroughly studied in 1877 by a German plant physiologist, Wilhelm Pfeffer.
 Osmosis can be best defined as the movement of water across a semipermeable membrane from an area of high water concentration to an area of lower water concentration.

So, the correct answer is 'Movement of water across a semi permeable membrane from an area of high water concentration to an area of lower water concentration'.

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