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Chapter: 11th Botany : Chapter 11 : Transport in Plants

Osmotic Pressure and Osmotic Potential in Plants

When a solution and its solvent (pure water) are separated by a semipermeable membrane, a pressure is developed in the solution, due to the presence of dissolved solutes.

Osmotic Pressure and Osmotic Potential

 

When a solution and its solvent (pure water) are separated by a semipermeable membrane, a pressure is developed in the solution, due to the presence of dissolved solutes. This is called osmotic pressure (OP) . Osmotic pressure is increased with the increase of dissolved solutes in the solution. More concentrated solution (low Ψ or Hypertonic) has high osmotic pressure. Similarly, less concentrated solution (high Ψ or Hypotonic) has low osmotic pressure. The osmotic pressure of pure water is always zero and it increases with the increase of solute concentration. Thus osmotic pressure always has a positive value and it is represented as π.

 

Osmotic potential is defined as the ratio between the number of solute particles and the number of solvent particles in a solution. Osmotic potential and osmotic pressure are numerically equal. Osmotic potential has a negative value whereas on the other hand osmotic pressure has a positive value.

 

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11th Botany : Chapter 11 : Transport in Plants : Osmotic Pressure and Osmotic Potential in Plants |


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