Organisms which obtain energy by the oxidation of reduced inorganic compounds are called : -
A
Photo autotrophs
B
Chemo autotrophs
C
Saprozoic
D
Coproheterotrophs
The answer is B.
Solution
Chemoautotrophs make their own food from $CO_2$ using energy obtained by oxidising reduced inorganic substances such as ammonia, nitrite, hydrogen sulphide, ferrous iron or hydrogen. Examples: nitrifying bacteria Nitrosomonas ($NH_3 \rightarrow NO_2^-$) and Nitrobacter ($NO_2^- \rightarrow NO_3^-$), sulphur bacteria and iron bacteria. Photoautotrophs get their energy from light; saprozoic organisms absorb dissolved organic matter. So such organisms are called chemoautotrophs.
ConceptChemoautotrophic bacteria
Biological Classification in past papers
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