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B
Solvent
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C
Both solvent and solutes
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D
None of above
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Solution
The correct option is B Solvent A semipermeable membrane allows the diffusion of solvent from a region of higher concentration of solvent to lower concentration of solvent passively without the expenditure of energy. It is mainly used in processes like osmosis. Osmosis is the process of diffusion of molecules from the region of higher concentration to the lower concentration through a semipermeable membrane. The cells absorb water by the process of endosmosis from its surrounding and water exits by the process of exosmosis.