Following are a few definitions of osmosis. Read carefully and select the correct definition.

Options

A. Movement of water molecules from a region of higher concentration to a region of lower concentration through a semipermeable membrane.
B. Movement of solvent molecules from its higher concentration to lower concentration
C. Movement of solvent molecules from higher concentration to higher concentration of solution through a permeable membrane
D. Movement of solute molecules from lower concentration to higher concentration of solution through a semipermeable membrane

Answer

A

Explanation

The movement of water molecules through selectively permeable membrane along concentration gradient is called osmosis. It is the passage of water from region of high water concentration through semipermeable membrane to a region of low water concentration (only through semipermeable membrane) Unicellular freshwater orgaisms and most plant cells tend to gain water through osomis. Absorption of water by plant roots is also an example of somosis