Asked by anmolsharmadp | 28th Jul, 2015, 07:39: PM

Expert Answer:

Osmotic Pressure

  • Osmotic pressure is the minimum pressure that must be exerted to prevent the passage of the pure solvent into the solution when the two are separated by a semi-permeable membrane.
  • It can also be defined as a measure of tendency of a solution to take in water by osmosis.
  • Plant cells exhibit a considerable range of variations in osmotic pressure.
  • In land plants, osmotic pressure varies from 5 to 30 atms, while in aquatic plants, it varies from 1 to 3 atms. Plants of arid regions possess the highest osmotic pressure.

Factors Affecting Osmotic Pressure

  • Concentration of solute particles
  • Ionisation of solute molecules
  • Temperature
  • Hydration

Importance of Osmotic Pressure in Plants

  • Leaves become turgid and expand because of their osmotic pressure.
  • Resistance of plants to drought and frost is brought about by osmotic pressure of their cells.

Answered by Sheetal Kolte | 29th Jul, 2015, 10:57: AM