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Starch (Iodine Test): The iodine test is used to detect the presence of starch in foods. A positive result is a blue-black color change.

Protein (Biuret Test): The biuret test is used to detect the presence of proteins in foods. A positive result is a violet color change.

2. Importance of Key Nutrients for a Balanced Diet:

• Starch: Provides a source of energy and is a major carbohydrate in the diet.

• Vitamin C: Essential for collagen production, wound healing, and a strong immune system.

3. Signs and Symptoms of Nutritional Deficiency:

• Iodine Deficiency (Goiter): Swelling of the thyroid gland in the neck.

• Vitamin A Deficiency (Night Blindness): Difficulty seeing in low light, dry skin.

• Vitamin D Deficiency (Rickets): Sun exposure, vitamin D supplements, and dietary sources like fortified dairy products.

• Iodine Deficiency (Goiter): Iodized salt or iodine supplements.