The osmotic parameter determining the flow of water from one cell to another is

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RPSC 2nd Grade Science (Held on 18th Feb 2019) Official Paper
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  1. Osmotic pressure
  2. Diffusion Pressure Deficit
  3. Turgor Pressure
  4. Hydrostatic Pressure

Answer (Detailed Solution Below)

Option 2 : Diffusion Pressure Deficit
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Explanation -

Diffusion Pressure Deficit (DPD):

  • The Diffusion Pressure Deficit (DPD) is the difference in diffusion pressure between two solutions.
  • Diffusion pressure deficit is defined as the difference between the diffusion pressure of water or solvent in a solution and that of pure water or solvent.
  • The gradient of diffusion pressure allows for rapid water absorption.
  • Due to the diffusion pressure gradient, it enables easy water absorption.
  • Water flows from a lower to a higher DPD level.
  • It's the difference between the osmotic and turgor pressures.
  • The osmotic pressure and the wall pressure (turgor pressure) that opposes the endosmotic entry of water influence the DPD of a cell, i.e. DPD = OP - wall pressure.

Thus, the osmotic parameter determining the flow of water from one cell to another is Diffusion Pressure Deficit (DPD).

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