If `DPD` represents diffusion pressure deficit, `OP` is the osmotic pressure and `TP` is the turgor pressure then which of the following equations is coorect?

Options

A. `DPD=OP=TP`
B. `DPD=OP+TP`
C. `DPD=OP-TP`
D. `DPD=OP`

Answer

C

Explanation

The reduction in the diffusion pressure of water in a solution over its pure state is called diffusion pressure defict or DPD. Diffusion pressure deficit is also called suction pressure. Its value is equal ot the osmotic pressure or potential (OP) (positive value taken in bars or atm) of the solution in a cell or system minus the wall pressure (WP) (=turgor pressure , TP) which opposes the entry of water into it provided the external water is pure. DPD = OP - WP (= TP)
Water is absorbed by a system having higher DPD from anthor system with lower DPD.