SSC MTS EXAM

Detailed explanation-1: -Carbon, hydrogen, nitrogen and oxygen are the major elements constituting about 95% of the protoplasm.

Detailed explanation-2: -The properties of different biological molecules depend on certain characteristic groupings of atoms called functional groups. Oxygen is the most abundant element contained within living organisms, composing about 65% of the whole-body mass.

Detailed explanation-3: -90% of protoplasm is made up of carbon, hydrogen, nitrogen and oxygen.

Detailed explanation-4: -Oxygen is the most common element in the human body, comprising approximately 65.0% of body mass. Most of the oxygen present is found in the form of water.