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Iodine is used to test a leaf for starch.
we need to put only a few drops of iodine on the boiled leaf to test for starch.
We need to observe it carefully blue black color shows the presence of starch.
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First we will heat a plant leaf in boiling water for 30 seconds (this stops its chemical reactions) heat it in boiling ethanol for a few minutes (this removes most of its colour) wash with water and spread onto a white tile. add iodine solution from a dropper. If it turns blue black it shows that it contains starch.
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