Comparison between Turgor Pressure and Wall Pressure MCQ - Practice Questions with Answers

• A filled vacuole provides a rigid structure to the plant cell.
• An empty vacuole causes the cell walls to shrink and pull away from the neighbouring cells. This causes the droopy appearance of the wilted plants.
• When a plant cell is placed in a pure solvent, endosmosis occurs due to the higher osmotic pressure of the cell sap.
• This causes an increase in the size of the vacuole.
• The increased vacuole begins to pressurise the protoplasm.
• This pressure with which the cell sap of the vacuole presses the protoplasm against the cell wall is called turgor pressure.
• Hence, turgor pressure is responsible for pushing the cell membrane against the cell wall.
• The cell wall is rigid. It also exerts equal and opposite pressure on the protoplasm.
• This pressure exerted by the cell wall on the protoplasm is called wall pressure.
• The turgor pressure and wall pressure are equal and opposite in direction.
• At any given moment, turgor pressure is equal to the wall pressure and the cell is in equilibrium. 
• When cells are placed in an isotonic solution, water does not flow within or outside.
• Such cells are called flaccid cells.

Important Tips:

• In a plasmolysed cell, Turgor pressure is zero.
• In a turgid cell turgor pressure is equal to osmotic pressure.
• Turgor pressure and wall pressure are absent in animal cells.