Q. About 98 percent of the mass of every living organism is composed of just six elements including carbon, hydrogen, nitrogen, oxygen and
A) sulphur and magnesium
B) magnesium and sodium
C) calcium and phosphorus
D) phosphorus and sulphur
Explanation
[Solution from source] Oxygen, carbon, hydrogen, nitrogen, calcium and phosphorus together make up about 98-99% of body mass; calcium and phosphorus are abundant in bone and nucleic acids. Sulphur, sodium and magnesium are present only in much smaller amounts. Answer (3).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.