Plant Cell Walls - 5  
311 Syllabus

The Table below tries to show the way in which Turgor Pressure develops.

Let us Imagine that a Cell which has little water in its Vacuole is placed into Pure Water. The Water molecules will diffuse into the Cell -> Vacuole to establish an equilibrium.	Some water Molecules have entered the Vacuole	Many Water Molecules have entered the Vacuole. Becuase the Cell Wall is rigid, the Volume of the Vacuole can not increase. However, the entrance of water molecules causes a pressure to develop in the cell. This is Turgor Presure.
In this case a Protoplast is placed in Pure Water	As the water molecules enter the cell, its Volume Increases because there is no Cell Wall to constrain it.	As the Volume increases, it bursts because the Plasmalemma is not strong enough to constrain the cell's contents.