Question

Define Osmosis. What are the different types of osmosis? Give examples. [5 MARKS]

Answer 1

Definition: 2 Marks
Naming : 2 Marks
Examples :1 Mark

Osmosis is a special type of diffusion.
This involves the passage of water across a selectively permeable membrane, from a region of high water concentration to a region of low water concentration.
Osmosis is also a passive transport as no external energy is required.

There are two type of osmosis:

Endosmosis : The process in which the water molecules enter into the cell.
Exosmosis : The process in which the water molecules move out of the cell.

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 the kidneys.