Question

what advantage does selective permeability of plasma membrane provide to the cell?

Answer 1

The advantage is that the bigger & toxic molecules are prevented from entering the cell which might be potentially very harmful for the cell.

Answer 2

The advantages of selective permeability of the plasma membrane is as follows:

• It maintains the concentration gradient in the cell.
• It protects the cell from swelling up due to osmosis.  
• It maintains the shape and turgor pressure (cellular pressure) present inside the cell.  
• It helps to maintain the cellular signalling pathway as most of the signalling mechanisms. involve triggering the cellular machinery using different ions.
• It checks the movement of protein in and out of the cell and protects it.