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Question

Select the ones which are correctly matched
I. Nitrosomonas – Nitrite to nitrate
II. Thiobacillus – Denitrification
III. Nostoc – symbiotic nitrogen fixer.
IV. Azotobactor – Anaerobic nitrogen fixer.

A
I
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B
II
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C
III
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D
IV
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Solution

The correct option is B II

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 is free- living nitrogen fixing aerobic microbes.

Nitrosomonas and / or nitrosoccocus oxidize to nitrite help of Nitrobacteria and Nitrocystis.


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