Turgor Pressure and Wall
Pressure
When a
plant cell is placed in pure water (hypotonic solution) the diffusion of water
into the cell takes place by endosmosis. It creates a positive hydrostatic
pressure on the rigid cell wall by the cell membrane. Henceforth the pressure
exerted by the cell membrane towards the cell wall is Turgor Pressure (TP).
The cell
wall reacts to this turgor pressure with equal
and opposite force, and the counter-pressure exerted by the cell wall
towards cell membrane is wall pressure (WP).
Turgor
pressure and wall pressure make the cell fully turgid.
TP + WP = Turgid.
Activity
Find the role of turgor pressure in sudden closing of leaves
when we touch the ‘touch me not’ plant.
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