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A-Level Biology OCR A

H O Capillary Explain Action Occurs Transpiration Molecule

Capillary action involves adhesion between water and vessel walls pulling water upward, with cohesion transmitting this force between water molecules, enabling upward movement against gravity.

Capillary action occurs when adhesion of water to vessel walls pulls water molecules upward, and cohesion between these water molecules transmits the pull, allowing water to move against gravity in a continuous stream.

Front Explain how capillary action occurs.
Back Capillary action:
  • Example: transpiration
  • One H2O molecule gets pulled up because of the adhesion of water to the walls of a vessel
  • This pulls H2O molecules which are below it, upwards due to cohesion between H2O molecules, causing a continuous stream 
  • This means that there is a net movement upwards, against gravity
 

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