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Natural Resources — Science STD 9 — Question

Gujarat BoardEnglish MediumSTD 9ScienceNatural Resources1 Mark
MCQ
Some bacteria have the ability to 'fix' nitrogen. This means:
  • A
    They convert nitrates into nitrogen gas.
  • B
    They breakdown useful nitrogen rich compounds and release ammonium ions.
  • ✓
    They convert atmospheric nitrogen gas into biologically useful forms of nitrogen.
  • D
    They convert ammonia into nitrites a nitrates.
✓

Answer

Correct option: C.
They convert atmospheric nitrogen gas into biologically useful forms of nitrogen.
Nitrogen$-f$ixing bacteria, microorganisms capable of transforming atmospheric nitrogen into fixed nitrogen $($inorganic compounds usable by plants$)$ More than $90$ percent of all nitrogen fixation is effected by these organisms, which thus play an important role in the nitrogen cycle.

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