A) Ferro bacillus
B) Beggiotoa
C) Nitro so monas and Nitro sococcus
D) Green-sulphur bacteria and purple bacteria
Correct Answer: D
Solution :
Green sulphur bacteria and purple bacteria are photoautotrophic in nature. They are photosynthetic in nature but are anaerobic and no \[{{O}_{2}}\] is evolve during photosynthesis. Beggiatoa is a sulphur oxidising bacteria. Ferrobacillus obtains energy by oxidising ferrous compounds to ferric forms. Nitrosomonas and Nitrosococcus obtains energy by oxidising ammonia to nitrite. Nitrosomonas, Nitrosococcus, Ferrobacillus and Beggiatoa all are chemoautotrophic bacteria.
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