Biomolecules Question 8
8. The four elements making $99 %$ of living system are
[1994]
(a) $C, H, O, S$
(b) $C, H, O, P$
(c) $C, H, O, N$
(d) $C, N, O, P$
Show Answer
Answer : c
Hints & Solutions
(c) Principal or major elements include oxygen, carbon, hydrogen and nitrogen. They are so named because they alone constitute $99 %$ of living system.