With the help of examples describe the classification of essential elements based on the function they perform.
Ans. Essential elements can be classified into four categories on basis of their functions –
(a) As components of biomolecules: These elements form the structural elements of cells.Examples: carbon, oxygen, hydrogen, and nitrogen.
(b) As elements in energy-related compounds: Magnesium in chlorophyll and phosphorus in ATP helps in the photosynthesis process and other metabolic activities that require energy.
(c) Elements that facilitate activation of enzymes like magnesium and zinc.
(d) Elements that can alter or influence osmotic pressure in the cells like potassium.