List of top Science Questions on Nitrogen Fixation asked in CUET (PG)

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A: The process of conversion of nitrogen \((N_2)\) to ammonia by living organisms is called biological nitrogen fixation.
Reason R: Nitrogenase enzyme which is capable of nitrogen reduction is present exclusively in Eukaryotes.
In the light of the above statements, choose the most appropriate answer from the options given below.