Correct Option
The correct option is (c) 2 and 3 only.
Explanation
Nutrients are classified into macronutrients (carbohydrates, fats, proteins) and micronutrients (vitamins, minerals). While macronutrients are required in large amounts primarily for energy and growth, micronutrients are needed in minute quantities for physiological regulation and protection.
Statement-wise Analysis
- Statement 1 is Incorrect: Minerals are micronutrients needed by the body in small amounts, not large amounts. Furthermore, minerals do not provide energy. Energy is primarily derived from carbohydrates and fats. Minerals are essential for various metabolic processes and structural functions.
- Statement 2 is Correct: Iodine is essential for the proper functioning of the thyroid gland, which is located in the neck. It is a key component of the hormone thyroxine, which regulates metabolism. Deficiency of iodine can cause goitre, visible as a swelling in the neck.
- Statement 3 is Correct: Calcium is a major structural component of the skeletal system. It is required for the formation and maintenance of healthy bones and teeth, as well as for muscle contraction and blood clotting.
Key Takeaway
Minerals are regulatory and structural nutrients required in small quantities; unlike carbohydrates and fats, they are not sources of energy for the human body.