Q. The four elements, called "Big-four" which make up $95\%$ of all elements found in a living system, are
NTA AbhyasNTA Abhyas 2020
Solution:
Elements present in living organisms are of two groups: Microelements and macroelements. Macroelements are again divided into two groups that are
(i) Principle element,
(ii) Non-principle elements.
Principle element:- C,H,O,N
Non principle elements:- Ca2+, Mg2+, Na2+, Cl-, S, K+, Fe2+, P
Microelements or trace elements:- cu2+, Zn2+, Mn2+, Mo, Ni, Se, Co, I, Cr, F
Carbon, hydrogen, oxygen and nitrogen are called life-forming elements, and it forms 95% of total cellular material because they form the most essential components of the cell in the form of carbohydrates, lipids and proteins. In carbohydrates and lipids, the frame is made up of C, H and O. In proteins, the frame is made up of C, H, and O, and N.
The Cell wall of any type of cell is made up of carbohydrates so C, H, O are called framework elements. Cell membranes and organelles are mainly made up of proteins and lipids. Most of the enzymes are proteinaceous in nature.
(i) Principle element,
(ii) Non-principle elements.
Principle element:- C,H,O,N
Non principle elements:- Ca2+, Mg2+, Na2+, Cl-, S, K+, Fe2+, P
Microelements or trace elements:- cu2+, Zn2+, Mn2+, Mo, Ni, Se, Co, I, Cr, F
Carbon, hydrogen, oxygen and nitrogen are called life-forming elements, and it forms 95% of total cellular material because they form the most essential components of the cell in the form of carbohydrates, lipids and proteins. In carbohydrates and lipids, the frame is made up of C, H and O. In proteins, the frame is made up of C, H, and O, and N.
The Cell wall of any type of cell is made up of carbohydrates so C, H, O are called framework elements. Cell membranes and organelles are mainly made up of proteins and lipids. Most of the enzymes are proteinaceous in nature.