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Model Paper 10 — NEET STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceNEETModel Paper 104 Marks
MCQ
Nitrifying bacteria, Nitrosomonas and Nitrobacter :
  • A
    Convert (oxidise) ammonia or ammonium compounds into nitrates.
  • B
    Convert carbon dioxides into carbohydrates.
  • C
    Convert nitrogen into nitrates.
  • D
    Convert nitrate into nitrogen.
✓

Answer

A. Convert (oxidise) ammonia or ammonium compounds into nitrates.
Explanation:
Nitrifying bacteria are chemolithotrophic organisms that include species of the genera Nitrosomonas, Nitrosococcus, Nitrobacter, and Nitrococcus. These bacteria get their energy through the oxidation of inorganic nitrogen compounds. Types include ammonia-oxidizing bacteria (AOB) and nitrite-oxidizing bacteria (NOB).
Many species of nitrifying bacteria have complex internal membrane systems that are the location for key enzymes in nitrification: ammonia monooxygenase (which oxidizes ammonia to hydroxylamine), hydroxylamine-oxidoreductase (which oxidizes hydroxylamine to nitric oxide - which is oxidized to nitrite by a currently unidentified enzyme), and nitrite oxidoreductase (which oxidizes nitrite to nitrate).

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