Question

Basic elements of life are

• A. $ C,H,O,N $
• B. $ C,P,H,S $
• C. $ H,O,N,S $
• D. $ P,C,O,N $

Answer 1

Answer: (A)

: Protoplasm is made up mainly of $ C,H,\text{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%), phosphorous (1.14%), chlorine (0.15%), sulphur (0.16%) and potassium, sodium, magnesium, iodine, iron etc. are in traces.