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Select the match ones.

       I             Nitrosomonas – Nitrite to nitrate

II           Thiobacillus     -  Denitrification

III          Nostoc               -  Free-living nitrogen-fixer

IV          Azotobacter     -  Anaerobic nitrogen-fixer

a)

I and II

b)

III and IV

c)

II and III

d)

II and IV



Question ID - 4200 | SaraNextGen Top Answer

Select the match ones.

       I             Nitrosomonas – Nitrite to nitrate

II           Thiobacillus     -  Denitrification

III          Nostoc               -  Free-living nitrogen-fixer

IV          Azotobacter     -  Anaerobic nitrogen-fixer

a)

I and II

b)

III and IV

c)

II and III

d)

II and IV

1 Answer
127 votes
Answer Key / Explanation : (c) -

(c)

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  to nitrite.

The nitrite is further oxidised to nitrate with the help of Nitrobacter and Nitrocystis.

127 votes


127