Question

Write the relation between Diffusion Pressure Deficit(DPD), Osmotic Pressure(OP), and Turgor Pressure(TP). ii) "OP and DPD are equivalent in a flaccid cell". Give reason.

Answer 1

Explanation:

1) The difference between diffusion pressure of pure water and solution is called diffusion pressure deficit (DPD). ... As the cell absorbs more and more water its Turgor Pressure increases andOsmotic Pressure decreases. When a cell is fully turgid, its OP is equal to TPand DPD is zero.

2) DPD in fully turgid cell: Osmotic pressure is always equal to turgor pressure in a fully turgid cell. OP = TP or OP-TP =0. ...DPD in flaccid cell: If the cell is in flaccidcondition there is no turgor pressure or TP=0. Hence DPD = OP

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.