Osmosis is

Passage of solvent only through a semipermeable membrane.

Passage of solutes only through a membrane.

Passage of both solvent and solute through a membrane.

Passage of solution through a protoplasm.

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Osmosis is the process of movement of molecules from the region of higher concentration to the lower concentration through a semipermeable membrane. The cells absorbs water by the process of endosmosis from its surrounding and water exits by the process of exosmosis. On absorption of water the turgor pressure inside the cells increases. It helps to maintain the shape of the cell. It helps in the growth, development, mechanical support and prevents wilting.

So, the correct answer is option A.

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