when a drop of iodine solution put on the cut surface of a Potato it turns blue black in colour. This indicate the presence of what ?

when a drop of iodine solution put on the cut surface of a Potato it t

1.	when a drop of iodine solution put on the cut surface of a Potato it turns blue black in colour. This indicate the presence of what ?
Answer» Iodine TEST is PERFORMED to test the PRESENCE of starch. It turns into BLUE if starch is present