A) by ionizing events such as lightning and effect of cosmic rays
B) ferredoxin enzyme and nitrogenase
C) by reduction of proteins to ammonia
D) by oxidation of ammonia to protein
Correct Answer: A
Solution :
The source of energy for non-biological nitrogen fixation is lightening and cosmic rays. The atmospheric nitrogen undergoes the following changes during lightening \[{{N}_{2}}+{{O}_{2}}\xrightarrow[{}]{{}}2NO\] \[2NO+{{O}_{2}}\xrightarrow[{}]{{}}2N{{O}_{2}}\] \[NO+{{O}_{3}}\xrightarrow[{}]{{}}N{{O}_{2}}+{{O}_{2}}\] \[2N{{O}_{2}}+{{H}_{2}}O\xrightarrow[{}]{{}}HN{{O}_{2}}+HN{{O}_{3}}\]
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