Question

Abundance of element in human body in descending order are

• A. O, C, H, N
• B. H, C, O, N
• C. C,O, H, N
• D. H, O, C, N

Answer 1

Answer: (A)

O, C, H, N

The four most common elements that comprise over 96% of the mass of the human body, in descending order of abundance are oxygen, carbon, hydrogen, and nitrogen. Oxygen is a structural component of all major biomolecules like carbohydrates, proteins, lipids and nucleic acids. Carbon, of course, provides the structural framework for living systems. Hydrogen occurs in all biomolecules and water. Nitrogen is a component of amino acids, nucleotides etc.

So, the correct answer is 'O, C, H, N'