Question

Differentiate between diffusion and osmosis?​

Answer 1

Osmosis and diffusion are the two different types of passive transport which play an important role in moving molecules in and out of the cell.

Osmosis

The process of moving of solvent particles across a semipermeable membrane from a dilute solution into a concentrated solution to equalize concentration. The complete process does not require energy in order to take place.

For example, The absorption of water molecules from the soil through the roots of the plant.

More to Explore: Reverse Osmosis

Diffusion

The process of moving particles from a region of higher concentration to the region of lower concentration until equilibrium is reached. The complete process does not require energy in order to take place.

For example, The diffusion of the perfume sprays into the air by spreading the aroma.

Difference between Osmosis and Diffusion

Osmosis Diffusion

It is limited only to the liquid medium. Occurs in all mediums – Solid, Liquid and gas.

Requires a semipermeable membrane. Do 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. Do 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.

Answer 2

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Differentiate between diffusion and osmosis.

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DIFFUSION-

In diffusion, no semipermeable membrane is used.

In this process,the solvent as well as the solute molecules move directly into each other.

It takes place from higher concentration to lower concentration.

It takes place in gases as well as solutions.

It cannot be stopped or reversed.

OSMOSIS-

In osmosis, a semipermeable membrane is used.

In this process, there is only flow of solvent molecules and that too through the semi-permeable membrane.

It takes place from lower concentration to higher concentration.

It applies to solutions only.

It can be stopped or reversed by applying pressure on the solution with higher concentration.

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