Iodine is used to test the presence of ________ in food.

Iodine is commonly used as a test for the presence of starch in food. This is known as the iodine test for starch, which is a simple and effective method to detect starch in various food items. Starch is an odorless, tasteless white substance commonly found in plant tissues, primarily obtained from cereals and potatoes. It is a polysaccharide that serves as a carbohydrate storage and is a vital part of the human diet.