A) carbon
B) hydrogen
C) oxygen
D) sodium.
Correct Answer: C
Solution :
: Carbon, oxygen, hydrogen and nitrogen are the major constituents of most biomolecules. Protoplasm is made up mainly of\[C,H,O,\]and N, which make up 95% by weight of the body. The proportions of various elements in protoplasm is - oxygen (65%), carbon (8%), hydrogen (10%), nitrogen (3%), calcium (2.5%), phosphorus (1.14%), chlorine (0.15%), sulphur (0.16%) and potassium, sodium, magnesium, iodine, iron etc. are in traces.
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