Which of the following is the main component of hair, muscle, and skin?

Correct option is C

Ans. (c) Protein
Sol. Proteins are the primary structural and functional components of hair, muscles, and skin. They are composed of amino acids, which are essential for tissue growth, repair, and maintenance. Keratin (in hair and skin) and actin & myosin (in muscles) are examples of important structural proteins.
Explanation of each option:
· (a) Fat – Provides energy and insulation but is not the main structural component of hair, muscles, or skin.
· (b) Carbohydrates – Serve as an energy source but do not contribute significantly to body structure.
· (c) Protein – Correct answer. It is the main structural component of hair (keratin), muscles (actin & myosin), and skin (collagen & elastin).
· (d) Mineral Salt – Essential for various body functions (e.g., calcium for bones), but not the main component of these tissues.