Osmosis differs from diffusion mainly in that in Osmosis, the water moves down the concentration gradient.
What is concentration gradient?
- “A concentration gradient occurs when the concentration of particles is higher in one area than another.”
What is diffusion?
- The movement of molecules (solutes as well as solvent) from its higher concentration to its lower concentration (down the concentration gradient) is known as diffusion.
- “The movement of molecules in diffusion is said to be 'down' or 'up' the concentration gradient.”
- It is responsible for the movement of molecules into and out of the cell.
What is osmosis?
- The movement of solvent/ water molecules from its higher concentration to its lower concentration through a semipermeable membrane (membrane that allow only specific molecules to pass through it) is called osmosis.
- The water moves till an equilibrium in maintained on the both side of membrane.
Hence, the correct option is: d. In Osmosis, the water moves down the concentration gradient.
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