Osmosis – diffusion of water molecules

Osmosis is the diffusion of molecules from a high to a low concentration across a partially permeable membrane. It is a special case of diffusion, the diffusion of water.


Partially permeable – only lets in certain substances (cell membrane)


How are root hair cells adapted to take up water by osmosis?

  • Have long extensions that increase surface area
  • Large surface area where osmosis can take place