Atmospheric nitrogen is fixed by Nitrogenase by converting $\mathrm{N}_2$ to $\mathrm{NO}_3^{-}$.

The catalytic redox center of Nitrogenase contains Mo and Fe as cofactors.

Nitrogenase can function optimally only in the presence of molecular oxygen.

The transport of important amides, like asparagine and glutamine, produced by transamination, to different parts of the plant body is mediated by phloem.

Active uptake by xylem

Pumping through plasmodesmata

Pumping through cortical cells

Formation of mycorrhizae