Testing for presence of starch in leaves

Testing for presence of starch in leaves

  • The leaf is boiled in hot water to kill the protoplasm
  • The boiled leaf is placed in boiling alcohol to remove chlorophyll
  • The leaf without chlorophyll is placed on a white tile and a drop of iodine added
  • After a few minutes, the parts of the leaf that contain starch turn the iodine from brown to blue/black.
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