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.