Class 8 Osmosis and Diffusion in Cell Biology
Osmosis and Diffusion in Cell: In the previous segment of the chapter ‘Cell Structure and Functions’, we were introduced to the Osmosis process. In this segment, let us learn more about the Osmosis process and understand the molecules’ transportation in a cell.
What are the Three types of osmotic solutions?
Osmosis is moving from higher to lower water concentration through a semi-permeable membrane.
For example, the swelling of raisins when kept in water for some time.
The movement of water is affected by the amount of the substance dissolved in it. Depending on the concentration of the solution, there are three types of osmotic solutions.
| Hypertonic Solution | Isotonic solution | Hypotonic Solution | |
| Water in the cell | More than in surrounding | Same as in the surrounding | Less than in surrounding |
| Water in the surrounding | Less than in cell | Same as in cell | More than in cell |
| Cells | Shrink | No change | Swell |
RBCs in different types of salt solutions
