Match the descriptions with corresponding nitrogen cycle processes appropriately

Question

Match the descriptions with corresponding nitrogen cycle processes appropriately. The descriptions may be used once, more than once or not at all. ammonification assimilatory nitrate reduction denitrification nitrification nitrogen fixation 1. oxidation of nitrate to nitrogen gas 2. reduction of ammonia to nitrate 3. reduction of nitrate to ammonia incorporated into amino acids 4. oxidation of atmospheric nitrogen 5. aerobic oxidation of ammonia to nitrate 6. reduction of atmospheric nitrogen to ammonia 7. anaerobic reduction of nitrate to nitrogen gas 8. anaerobic oxidation of ammonia 9. release of ammonia from organic compounds

Explanation / Answer

Ammonification: there are no description for ammonification in the given question.

Assimilatory nitrate reduction: reduction of nitrate to ammonia Incorporated into amino acids

Because nitrate are first reduced to nitrite and then ammonia for amino acids incorporation.

Denitrification: 1) oxidation of nitrate to nitrogen gas

Because nitrate is converted into nitrogen gas by some bacterial species as these bacteria use nitrate as electron acceptor instead of oxygen while respiration.

2) Anaerobic oxidation of nitrate to nitrogen gas

Some anaerobic bacteria perform denitrification respiration that reduces nitrate to nitrogen gas as these bacteria use nitrate as electron acceptor.

Nitrification: aerobic oxidation of ammonia to nitrate.

Because nitrification is an aerobic process in which ammonia is oxidized to nitrate, this is the most important step in nitrogen cycle.

Nitrogen fixation: reduction of atmospheric nitrogen to ammonia

As nitrogen fixation is a process in which nitrogen is reduced into ammonia which is required for biosythesis of building blocks such as DNA RNA etc.

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