The standard practical investigation is: Testing a Leaf for Starch


A leaf needs to be partially covered with tin foil, or a plant needs to be stored in a dark cupboard for at least 24 hours before the practical.

Method(Watch the Video)

  1. Place a leaf in a beaker with water and boil for 5 minutes.

  2. Remove the leaf, place the leaf in a test tube and cover with ethanol.

  3. *Turn off the Bunsen burners.  Ethanol is highly flammable*

  4. Place the test tube back into the beaker and allow it to boil for 5 minutes.

  5. Remove the leaf from the ethanol and place on a white tile.

  6. Cover the leaf with iodine.

  7. Observe the colour changes.

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All images sourced from unless otherwise stated