AIM : To test the presence of starch in leaves.
MATERIALS REQUIRED :potted plant ,methylated spirit,leaf ,boiling tube,tripod stand,Bunsen burner,asbestos gauze,iodine solution ,petri dish.
1.Let us take a leaf of a potted plant
2. Boil the leaf in methylated spirit over a water bath till it becomes pale-white due to the removal of chlorophyll.
3.Observe the leaf.
4. Spread the leaf in a petri dish and add a few drops of tincture iodine / betadine solution to it .Again observe the leaf.
OBSERVATION :The leaf turns blue black in color.
INFERENCE: The presence of starch will be indicated by a blue - black color.