The six major elements constitute body mass Class 10 Science (MCQ) Answer

The six major elements constitute body mass:

Answer

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Hint:

The human body is made up of many compounds like oxygen, calcium, carbon, hydrogen, nitrogen, calcium and phosphorus. They contribute to the human body functions in many ways. Out of these, oxygen is the greatest constituent of the body mass.

Complete Answer:

• 98% of the human weight is made up of six major elements.
• Oxygen (65%) – Most abundant. Essential for respiration. Makes up 20% of the air and 89% of the water weight in our body.
• Carbon (18%) – Forms the backbone of carbohydrates, fats, and proteins. Releases energy on breakdown.
• Hydrogen (10%) – Key element in water and DNA.
• Nitrogen (3%) – Present in amino acids and DNA. Crucial for cellular structures.
• Calcium (1.5%) – Found in bones and teeth. Supports muscle and nerve function.
• Phosphorus (1%) – Exists as phosphates. Found in bones, brain, and ATP (Adenosine Triphosphate).
• Potassium (0.35%) – Important for nerve signal transmission. Stored in red blood cells.
• Sulphur (0.25%) – Present in some amino acids and proteins.
• Sodium (0.15%) – Regulates water balance and helps in nerve signaling.

Thus, the option (C) is correct.

Note:

Phosphorus is found in the human body as phosphates, phosphorus ions associated with four oxygen atoms. The human skeleton and brain are major phosphate storage sites where it exists as calcium phosphate. Additionally, phosphates are present in ATP (Adenosine Triphosphate)—the energy molecule that powers various biological functions.