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Question

In the nitrogen cycle, nitrite is covered into nitrate by

A
Rhizobium
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B
Nitrobacter
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C
Nitrosomonas
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D
Azotobacter
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Solution

The correct option is B Nitrobacter
The conversion of ammonia to nitrate is performed primarily by soil living bacteria and other nitrifying bacteria. In the primary stage of nitrification, the oxidation of ammonium (NH4+) is performed by bacteria such as the nitrosomonas species, which converts ammonia to nitrites (NO2-). Other bacterial species, such as nitrobacter, are responsible for the oxidation of the nitrites into nitrates (NO3-). It is important for the ammonia to be converted to nitrates, because accumulated nitrites are toxic to plant life.

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