What are two types of postural defects and what class of food turns purple with iodine solution?

Here are the answers to your questions:

6. Two types of postural defects are:

   • Scoliosis (sideways curvature of the spine)
   • Kyphosis (excessive outward curvature of the spine, leading to a hunchback)

7. a) The food item turned purple when iodine solution was added, which is a positive test for starch. Therefore, the class of the food item is carbohydrate.