With the help of examples describe the classification of essential elements based on the function they perform.
i. Essential elements as components of energy-related compounds
Example: Magnesium in chlorophyll and phosphorus in ATP molecule
ii. Components of Structural elements of cells
Example: Hydrogen bonds are seen in the secondary structure of proteins, Carbon and Oxygen in proteins, lipids, carbohydrates and nucleic acids.
iii. Essential elements as Activator and Inhibitor of enzymes:
Example: Magnesium (Mg2+) is an activator of both Ribulose Bisphosphate and Phosphoenolpyruvate enzyme which are involved in photosynthetic carbon fixation.
iv. Essential elements which can alter osmotic pressure:
For example, Potassium plays an important role in the opening and closing of Stomata.