A) Nitrogen gas
B) Nitrogen dioxide
C) Nitrate
D) Nitric acid
Correct Answer: C
Solution :
Nitrogen is present in the environment as organic nitrogen, ammonium, nitrite, nitrate, nitrous oxide, nitric oxide or inorganic nitrogen gas. Nitrogen is available to plants as either ammonium \[(N{{H}_{4}}^{+})\] or nitrate \[(N{{O}_{3}}^{-})\]. Chemical processing or natural fixation (bacterial conversion) is necessary to convert gaseous nitrogen into compounds such as nitrate or ammonia which can be used by plants.
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