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Q:

Which one of the following organisms has a role in converting nitrates to free nitrogen?

  • 1
    Pseudomonas
  • 2
    Nitrosomonas
  • 3
    Nitrobacter
  • 4
    Rhizobium
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Answer : 4. "Rhizobium"
Explanation :

Nitrates are reduced back into nitrogen in the soil by a process called denitrification. This process is performed by bacteria like Pseudomonas denitrificans, etc.

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