What determines the diffusion of water from one cell to other?

The correct answer is DPD.

Concept:

• Diffusion is a movement of substances from the region of their high concentration to the region of their lower concentration. 
• The diffusion process is an important phenomenon in plants as it is the only means of the transport of the gases and materials in them.

Explanation:
Diffusion pressure deficit (DPD)

• Diffusion pressure deficit (DPD) is the force that determines the flow of water from one cell to the another. 
• It is the difference in diffusion pressure between two solutions. 
• It is the amount by which the diffusion pressure of water or solvent in a solution is less than the diffusion pressure of pure water or solvent.
• Because of the diffusion pressure gradient, it allows for easy water absorption. Water flows from low to high Diffusion pressure deficit.
• DPD = Osmotic Pressure - Turgor Pressure

Important Points

• DPD in a plant is an important parameter as it defines how much water a cell can take up.
• For a turgid cell, DPD is zero.
• Whereas, it will be highest for a plasmolyzed cell.

Additional Information

• Osmotic pressure (OP)
  • It is defined as the amount of pressure which must be applied in order to prevent the passage of solvent due to osmosis.
• Water potential (WP)
  • The difference between the free energy of water molecules in pure water and the energy of water in any other system is known as water potential.
• Turgor pressure (TP)
  • When water enters a plant cell through diffusion, it becomes turgid due to building up of pressure against the cell wall in a plant system, this pressure is known as turgor pressure.