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The oxidation of nitrite to nitrate in soil is carried out by

  • A.Desulfovibrio
  • B.Nitrobacter
  • C.Nitrosomonas
  • D.Rhizobium

Answer: B

Nitrobacter completes nitrification by oxidising nitrite to nitrate, the form most readily taken up by plant roots and also the most easily leached. Nitrosomonas performs the first step, Rhizobium fixes nitrogen and Desulfovibrio reduces sulphate.

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