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Select the correctly matched ones from the following.
I. Nitrosomonas - Nitrite to nitrate
II. Thiobacillus - Denitrification
III. Nostoc - Free-living nitrogen-fixer
IV. Azotobacter - Anaerobic nitrogen-fixer
Options:
I. Nitrosomonas - Nitrite to nitrate
II. Thiobacillus - Denitrification
III. Nostoc - Free-living nitrogen-fixer
IV. Azotobacter - Anaerobic nitrogen-fixer
Solution:
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Verified Answer
The correct answer is:
II and III
Nitrate present in the soil is reduced to nitrogen by the process of denitrification. Denitrification is carried by bacteria Pseudomonas and Thiobacillus.
A number of cyanobacteria such as Anabaena and Nostoc are free-living nitrogen-fixers.
Azotobacter and Beijernickia are free-living nitrogen-fixing aerobic microbes.
Nitrosomonas and/or Nitrosococcus oxidise NH3 to nitrite.
The nitrite is further oxidised to nitrate with the help of Nitrobacter and Nitrocystis.
A number of cyanobacteria such as Anabaena and Nostoc are free-living nitrogen-fixers.
Azotobacter and Beijernickia are free-living nitrogen-fixing aerobic microbes.
Nitrosomonas and/or Nitrosococcus oxidise NH3 to nitrite.
The nitrite is further oxidised to nitrate with the help of Nitrobacter and Nitrocystis.
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