Nitrogen fixing enzyme found in root nodules is

A nitrogen-fixing enzyme found in root nodules is Nitrogenase.
Nitrogenases are enzymes that are produced by certain bacteria, such as cyanobacteria (blue-green bacteria) and rhizobacteria.
These enzymes are responsible for the reduction of nitrogen (N₂) to ammonia (NH₃). Nitrogenases are the only family of enzymes known to catalyze this reaction, which is a key step in the process of nitrogen fixation.