Fill in the blanks by choosing the correct alternative from those given in brackets.
The pressure by which the ......... molecules tend to cross the semi-permeable membrane is called osmotic pressure. (Salt / water)
Osmotic pressure is the minimum pressure that is applied to prevent the passage of pure solvent into the solution. Thus water being the pure solvent passes over to a higher concentrated sap in the cell across the semi-permeable membrane. The pressure applied to prevent the passage of water is known as the osmotic pressure.
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