Question

what is osmotic pressure (O.P.) and diffusion pressure deficit (D.P.D.)?

Answer 1

Osmotic Pressure(O.P.):

The pressure that would have to be applied to a pure solvent to prevent it from passing into a given solution by osmosis, often used to express the concentration of the solution.

Diffusion Pressure Deflict(D.P.D):

The term diffusion pressure deficit was coined by B.S Meyer in 1938. Originally DPD was described as suction pressure by Renner. It a reduction in the diffusion pressure of water in solution or cell over its pure state due to the presence of solutes in it and forces opposing diffusion.