1) The major reservoir of nitrogen is a) atmosphere b) soil c) water d) rocks 2) Biological Nitrogen Fixation refers to the conversion of a) N2 to NO3- and NH3 b) N2 to NO2 c) N2 to NH3 d) NH3 to NO3 3) Approximately 70% of nitrogen fixed is through biological fixation. The nitrogen fixing bacterium that lives symbiotically in the roots modules of  leguminous plant is a) Clostridium b) Azotobacter c) Rhizobium d) Pseudomonas 4) Free living nitrogen fixers that helps in N2 fixation are a) Azotobacter and Clostridium b) Anabaena and Nostoc c) Beijerinckia and Klebsiella d) All of the above 5) Conversion of NH3 to NO2- and then to nitrate NO3- is called a) Denitrification b) Assimilation c) Ammonification d) Nitrification 6) NO2 is further oxidized and converted to NO3 by a bacterium called a) Nitrobacter b) Pseudomonas c) Acetobacter d) Nitrosomonas 7) The plants absorb NO3 from the soil and use them for the synthesis of proteins. The process is called a) Nitrification b) Assimilation c) Ammonification d) Denitrification 8) The process where NH4 is created from amino acids by decomposers is a) Amination b) Nitrogen Fixation c) Ammonification d) Nitrification 9) The process where fixed nitrogen is returned back to the atmosphere by converting NO3- back to N2 is a) Denitrogen Fixation b) Denitrification c) Ammonification d) Deamination 10) The bacteria involved in denitrification process include a) Pseudomonas b) Thiobacillus denitrificans c) Micrococcus denitrificans d) All of the above

Nitrogen Cycle

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