A difference between diffusion and osmosis is

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In osmosis only the solvent moves while in diffusion both solute and solvent move.

A semi-permeable membrane is required for osmosis while diffusion requires no semi-permeable membrane.

all the above

In osmosis movement of molecules is only in one direction whereas in diffusion movement is on both sides.

answer is D.

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Detailed Solution

Osmosis	Diffusion
It is limited only to the liquid medium.	Occurs in liquid, gas and even solids.
Requires a semipermeable membrane.	Does not require a semipermeable membrane.
Depends on the number of solute particles dissolved in the solvent.	Depends on the presence of other particles.
Requires water for the movement of particles.	Does not require water for the movement of particles.
Only the solvent molecules can diffuse.	Both the molecules of solute and solvent can diffuse.
The flow of particles occurs only in one direction.	The flow of particles occurs in all the directions.
The entire process can either be stopped or reversed by applying additional pressure on the solution side.	This process can neither be stopped nor reversed.
Occurs only between similar types of solutions.	Occurs between the similar and dissimilar types of solutions.
It involves the movement of only solvent molecules from one side to the other.	It involves the movement of all the particles from one region to the other.