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Bio 6th vid 2

QuestionAnswer
High water concentration = =Low solute concentration and less concentrated
Lower water concentration = High solute concentration and more concentrated
What is Osmosis? Osmosis is the movement of water molecules across a selectively permeable membrane from a region of high-water concentration to a region of low water concentration
Why is osmosis a special type of diffusion? Both processes involve the movement of molecules from a high concentration to a low concentration. Both are passive (i.e. require no external energy)
How does osmosis differ from diffusion? Diffusion does not require a selectively permeable membrane, but osmosis does and osmosis only involves movement of water
Osmosis and food preservation Bacteria and fungi cause food to decay. Osmosis prevents micro-organisms from decaying food.
How does salting meat preserve it? Salted meat causes the micro-organisms (Bacteria) on the meat to lose water and die due to osmosis. Salt creates a high solute concentration on outside of cell. Examples of food preservation, Sugar in Jam and Salting meat
Created by: Louie Masterson
 



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