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  • When kept in water, raisin swells in size. Name and explain the phenomenon involved with the help of a diagram. Give three applications of the phenomenon.

When kept in water, raisin swells in size. Name and explain the phenomenon involved with the help of a diagram. Give three applications of the phenomenon.

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Raisins swell in water due to osmosis. Water moves from a place of lower concentration (Water holder) to higher concentration (Raisin) through the skin of raisin which acts as a semipermeable membrane.

 
Applications of the phenomenon

  1. Water moves from soil to plant roots partly due to osmosis.
  2. Preservation of meat against bacterial action by adding salt.
  3. Preservation of fruits against bacterial action by adding sugar. Bacterium in canned fruit loses water through the process of osmosis, shrivels, and dies.
  4. Reverse osmosis is used for desalination of water.

 

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