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  • Reaction carried out by metabolizing microbes include <img alt="\\\text{i}.2 \mathrm{NH}

Reaction carried out by \mathrm{N}_2metabolizing microbes include

\\\text{i}.2 \mathrm{NH}_3+3 \mathrm{O}_2 \rightarrow 2 \mathrm{NO}_2^{-}+2 \mathrm{H}^{+}+2 \mathrm{H}_2 \mathrm{O}\\ \\\text{ii}. 2 \mathrm{NO}_2^{-}+\mathrm{O}_2 \rightarrow 2 \mathrm{NO}_3^{-}

Which of the following statements about these equations is not true?

Option: 1

Step I is carried out by Nitrosomonas or Nitrococcus

 


Option: 2

Step Il is carried out by Nitrobacter


Option: 3

Both steps | and II can be called nitrification


Option: 4

Bacteria carrying out these steps are usually photoautotrophs


Answers (1)

best_answer

Biological nitrogen fixation is carried out by microbes (free-living or symbiotic) which are chemoautotrophic (organisms that derive energy from the oxidation of inorganic compounds). These don’t utilize light as a source of energy, hence are not photoautotrophs. Hence, the correct answer is option 4.

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avinash.dongre

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