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Sunday, 24 May 2015

Define Osmosis. What are different types of osmosis And Give examples of osmosis

Define Osmosis. What are different types of osmosis? Give examples of osmosis. 

Answer: Osmosis is a special type of diffusion i.e. passage of water (solvent) across a selectively permeable membrane,  from a region of high water
concentration (dilute solution) to the region of low water concentration (concentrated solution). 

Osmosis is also a passive transport i.e. no external energy is required for the passage. 

There are two type of osmosis: 

1. Endosmosis: The process in which the water molecules enter into the cell is known as endosmosis. 

2. Exosmosis: The process in which the water molecules move out of the cell is known as exosmosis. 

Examples of Osmosis are: 

1.Absorption of water by plant roots. 2.Absorption of water by alimentary canal. 
3.Re-absorption of water by tubules of the nephron in kidneys.

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