micheal
Q.3: Nitrogen is fixed in ecosystems in ways stated below. Which one of the statements below is false?
B.By electrical discharges in the atmosphere
C.By industrially synthesised fertilizer
D.By denitrification
Option D is the correct answer
Nitrogen fixation involves the conversion of nitrogen gas into ammonium compounds in various ways.
Denitrification, however, converts nitrogenous compounds such as nitrates into nitrogen.
Answer: Option D ( By denitrification )
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Nitrogen molecule is inert and to break it into free atom (N2) that can react with other atmospheric elements to form compounds such as Nitrites, Ammonia and Nitrates require energy that is derived from the industrial processes, atmospheric fixing (lightning, and natural fixing/biological processes. This entire process is called Nitrogen Fixation, and therefore the three; cyanobacteria (biological process), electrical discharges in the atmosphere (natural fixation), and industrially synthesized fertilizer fix nitrogen into the ecosystem.
Conversely, denitrification is the process by which the free nitrogen is removed from the atmospheric nitrogen compounds such as nitrous oxide, nitric oxide, and nitrous acid and passed to the ecosystem. Therefore, denitrification is the false statement in this regard.