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Question

Some bacteria such as ‘X’ and ‘Y’ occur in soil which reduce nitrate to nitrogen by the process of ‘Z’. Identify ‘X’, ‘Y’ and ‘Z’.

A
‘X’-Nitrobacter, ‘Y’-Nitrococcus, ‘Z’-Ammonification
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B
‘X’-Nitrosomonas, ‘Y’-Thiobacillus, ‘Z’-Ammonification
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C
‘X’-Pseudomonas, ‘Y’-Thiobacillus, ‘Z’-Nitrification
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D
‘X’-Pseudomonas, ‘Y’-Thiobacillus, ‘Z’- Denitrification
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Solution

The correct option is D ‘X’-Pseudomonas, ‘Y’-Thiobacillus, ‘Z’- Denitrification
Denitrification (Z) is the process of converting nitrates into molecular nitrogen with the help of bacteria like Pseudomonas (X) and Thiobacillus (Y).

Ammonification can be defined as the process in which nitrogenous organic compounds are converted into ammonia or ammonium ions(NH4+). This process is carried out by some decomposing bacteria like Bacillus.

Nitrification is the process that converts ammonia to nitrites and nitrates. This process is carried out by Nitrosomonas, Nitrobacter and Nitrococcus bacteria.

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