The bacterium which reduces the fertility of soil is
A
Nitrosomonas
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B
Bacillus denitrificans
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C
Azotobacter sp.
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D
Nitrobacter
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Solution
The correct option is CBacillus denitrificans Bacillus denitrificans is a Gram-negative chemolithoautotroph. It is a denitrifying bacteria. It converts the nitrate present in the soil to atmospheric nitrogen. It reduces the amount of available nitrogen for plants in the soil. Hence, It reduces the fertility of soil and are harmful for crops.
Thus, the correct answer is 'Bacillus denitrificans.'