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Which of the following bacteria reduce nitrate in soil into nitrogen?

1. Nitrosomonas
2. Nitrobacter
3. Nitrococcus
4. Thiobacillus

Correct answer: Thiobacillus

Solution

Thiobacillus is associated with denitrification, the process that reduces nitrate to nitrogen compounds/gas in soil. The other options are nitrifying bacteria that oxidize ammonia or nitrite instead of reducing nitrate.

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