Question

What statement can be cited for 10% sodium chloride solution and 10% sugar solution present?
A. Both have an equal OP.
B. the concentration of sodium chloride solution will be less than the concentration of sugar solution.
C. The OP of sugar solution will be higher than OP of sodium chloride solution.
D. DPD of sodium chloride solution will be higher than DPD of sugar solution.

Answer 1

Diffusion pressure deficit (DPD) is the deficit in osmotic pressure caused due to presence of solute molecules in the solution. In DPD, sugar molecules will not split while sodium chloride molecules will split into 2 ions.

Complete Answer:
To answer this question, first, we need to know about the DPD (diffusion pressure deficit). Diffusion pressure deficit is the pressure differentiation among solution and pure water or we can say that DPD of a cell is the thirstiness of the cell for water. Its value is zero for a completely turgid cell and highest for a cell which are plasmolysed. DPD performs a vital role in the ascent of sap in plants.
Now, let us find the solution from the option.
More the number of solute particles greater will be the deficit.
In the above two solutions such as the sodium chloride molecule will separate into two ions, one sodium ion and another chloride ion. The sugar molecule will not divide. The quantity of elements in sodium chloride solution will be two times more than the quantity of elements in sugar solution. Thus, the DPD of sodium chloride solution will be more than DPD of sugar solution.

Thus, the correct option is D. i.e. DPD of sodium chloride solution will be higher than DPD of sugar solution.

Note: Diffusion Pressure Deficit (DPD) is the pressure difference between pure water and solution. Osmotic pressure is required to be put to a solution to prevent the flow of its pure solvent whereas turgor pressure is the pressure inside a cell that moves the cell wall against plasma membrane. When a plant cell is kept in a hypotonic solution, the cell absorbs water through the process of osmosis and becomes fully turgid (no water can be absorbed). Cell membrane gets fully stretched and hence, osmotic pressure decreases and becomes equal to turgor pressure of the cell.