Discussion
Which one of the following use inorganic compounds as an energy source?
Answer: B
The answer is chemolithotrophs.
Chemolithotrophs obtain energy by oxidising inorganic compounds such as ammonia (Nitrosomonas), nitrite (Nitrobacter), hydrogen sulfide or sulfur (Thiobacillus), ferrous iron or hydrogen gas. The prefix litho, rock, refers to the inorganic energy source.
Heterotrophs and chemoorganotrophs take energy from organic compounds. Photoheterotrophs use light for energy and organic compounds as their carbon source.
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