Nitrogen is a component of

Match the following columns:

Column-$I$	Column-$II$
$P$. $Mg^{2+}$	$I$. Rubisco and $PEPcase$
$Q$. $Zn^{2+}$	$II$. Alcohol dehydrogenase
$R$. $Mo$	$III$. Nitrogenase

Which element is essential for the growth of the root tip?

Statement $P$: Phosphorus is essential for normal growth and reproduction in our body.
Statement $Q$: Copper is important in the synthesis of chlorophyll in plants.

Which element shows the given characteristics?
$(i)$ It maintains an anion-cation balance in cells.
$(ii)$ It is also involved in protein synthesis.
$(iii)$ It is required for the opening and closing of stomata.
$(iv)$ It is required for the maintenance of the turgidity of cells.

Which mineral elements are essential for the maintenance of $pH$ and osmotic pressure of intracellular fluids?