Question

Why do we put the leaf on a white tile before adding the iodine solution.

Answer 1

Iodine solution is used to test leavesfor the presence of starch. You need to: ... add the leaf to boiling ethanol in a water bath for a few minutes (the boiling ethanol dissolves the chlorophyll and removes the green colour from the leaf - it turns white so it is easy to see the change in colour)