hi...i wanted to tell you that there was this question in the chapter test that

Sudha took a small amount of an unknown food item in a test tube. Then, she added a few drops of iodine to it. The colour of the unknown food item changes to blue-black.

The change in colour of the food item to blue-black indicates the presence of options:-

• A)

  carbohydrates

• B)

  vitamins

• C)

  proteins

• D)

  fats

• i have been taught that if you mix iodine with foodstuff therefore it will show pressence of strach then how was the ans carbohydrates?