Define and explain the importance of following phenomenon in the living cells (a) Diffusion (b) Osmosis.
Q. Define and explain the importance of following phenomenon in the living cells (a) Diffusion (b) Osmosis.
Ans. (a) Diffusion: This is a phenomenon of spontaneous movement of molecules from a region of higher concentration to lower concentration. This process is faster in the gaseous phase than in liquids and solids. This process leads to a uniform concentration within a cell.
Importance: The substances (molecules, ions) such as CO2, O2, H2O, etc., can move across the plasma membrane by a process called diffusion.
(b) Osmosis: It involves the movement of water molecules (solvent particles) from a region of its higher concentration to a lower concentration through a semipermeable membrane.
Importance: It is a pure mechanical diffusion process by which cells absorb water without spending any amount of energy.
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