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Sulphate is reduced to hydrogen sulphide in waterlogged soil by

  • A.Thiobacillus
  • B.Nitrosomonas
  • C.Streptomyces
  • D.Desulfovibrio

Answer: D

Desulfovibrio is an obligate anaerobe that uses sulphate as an electron acceptor, producing the hydrogen sulphide responsible for the rotten-egg smell and the black iron sulphide of gleyed soils. Thiobacillus runs the same cycle in the opposite direction.

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