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Whether Wall pressure and osmotic pressure are equal?and why fully turgid cell has turgor pressure equal to osmotic pressure .

Whether Wall pressure and osmotic pressure are equal?and why fully turgid cell has turgor pressure equal to osmotic pressure
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Grade:

1 Answers

Arun
25763 Points
2 years ago

If there is no cell wall, and osmotic pressure is high enough, the cell can pop. If there is a cell wall, it can withstand the pressure, creating turgor pressure equal and opposite to osmotic pressure.

Plant cells are embedded with cell walls. Two conditions are possible during normal conditions:

hypotonic pressure conditions: When pressure inside the cytoplasm is lower than the pressure of vessels and water tends to get inside.

and

hypertonic pressure conditions: When pressure inside the cytoplasm is higher than the pressure of vessels and water tends to fall out.

In both the cases, if excess water transfer takes place, first condition could lead to bursting of cells whereas the second can lead to excessive shrinkage. To prevent this, cell wall along with turgid cell comes to rescue. Note that this only happens in fully turgid condition as in all other conditions pressure dynamic equilibrium is not required.

As cells absorb more water, the cell wall turns turgid and hard preventing further water intake. whereas in case of hypertonic condition it shrinks by that amount to prevent water from expelling out of the cell.

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