HORTICULTURE

Detailed explanation-1: -Iodine is used to test the presence of starch.

Detailed explanation-2: -Starch Test: Add Iodine-KI reagent to a solution or directly on a potato or other materials such as bread, crackers, or flour. A blue-black color results if starch is present.

Detailed explanation-3: -The basic principle involved in the iodine test is that Amylose interacts with starch to form a blue-black colored complex with the iodine. The helical structure of Amylose forms a charge transfer (CT) complex with iodine, wherein iodine is present inside the spiral or helical structure of the Amylose.