Question

Big four elements are

• A. Carbon, Hydrogen, Oxygen and Sulphur
• B. Carbon, Oxygen, Sulphur and Phosphorous
• C. Carbon, Nitrogen, Sulphur and Phosporous
• D. Carbon, Hydrogen, Oxygen and Nitrogen

Answer 1

Answer: (D)

Carbon, Hydrogen, Oxygen and Nitrogen

Oxygen is the most abundant element for the living organism. It is used for respiration. The oxygen inhaled supports the oxidation of food and releases energy. It plays an important role in the oxidative phosphorylation occurring in the mitochondria. The process produces energy in form of ATP.

Nitrogen is important component of the amino acids which is a monomer of protein.

Carbon and hydrogen is a important constituent of carbohydrates which is a instant source of energy.

So, the correct answer is option D.