Question

What is diffusion pressure deficit (or DPD)?

Answer 1

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The amount by which diffusion pressure of a solution is lower than its pure solvent is known as Diffusion Pressure Deficit (or DPD).

This term was first coined by B.S. Meyer in the year 1938.

DPD of pure water is the lowest, dilute solution is high, concentrated solution is highest.

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Answer 2

Answer:

Diffusion Pressure Deficit (DPD):

• Diffusion pressure deficit (DPD) is the difference between diffusion pressure of pure water and solution.

• DPD is also called suction force (SF) or suction pressure (SP).

• DPD, i.e. diffusion pressure deficit of a solution is initially equal to its osmotic pressure (OP).

• When water enters into a cell, the increasing turgor pressure (TP), forces the cytoplasm against cell wall.

• The cell wall exerts an equal and opposite pressure (WP) on the cell sap. This can be represented as:

DPD = OP-TP (WP)

In this, DPD is diffusion pressure deficit, OP is osmotic pressure, TP is turgor pressure and WP is wall pressure