Green manure plants belong to

$Nif$ genes occur in

The given equation refers to:
$N_{2} + 8e^{-} + 8H^{+} + 16ATP \rightarrow 2NH_{3} + H_{2} + 16ADP + 16P_{i}$

Which element plays an important role in nitrogen fixation?

We find that $Rhizobium$ forms nodules on the roots of leguminous plants. Also,$Frankia$,another microbe,forms nitrogen-fixing nodules on the roots of the non-leguminous plant $Alnus$. Can we artificially induce the property of nitrogen fixation in a plant,whether leguminous or non-leguminous?

Identify the non-leguminous plants that form nodules to fix nitrogen.