Explain the types of mineral elements with examples.

(N/A) Mineral elements are classified into two main types based on the quantity required by plants:
$(i)$ Macronutrients: These are generally present in plant tissues in large amounts (in excess of $10 \text{ mmol } kg^{-1}$ of dry matter).
$\Rightarrow$ The macronutrients include carbon,hydrogen,oxygen,nitrogen,phosphorus,sulphur,potassium,calcium,and magnesium.
$\Rightarrow$ Of these,carbon,hydrogen,and oxygen are mainly obtained from $CO_2$ and $H_2O$,while the others are absorbed from the soil as mineral nutrition.
$(ii)$ Micronutrients (Trace elements): These are needed in very small amounts (less than $10 \text{ mmol } kg^{-1}$ of dry matter).
$\Rightarrow$ These include iron,manganese,copper,molybdenum,zinc,boron,chlorine,and nickel.
$\Rightarrow$ In addition to the $17$ essential elements named above,there are some beneficial elements such as sodium,silicon,cobalt,and selenium,which are required by higher plants.