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Natural Resources — Science STD 9 — Question

Gujarat BoardEnglish MediumSTD 9ScienceNatural Resources1 Mark
MCQ
The most important function of Rhizobium is:
  • A
    Ammonification.
  • B
    Nitrification.
  • ✓
    $N_2$ fixation.
  • D
    $N_2$ assimilation.
✓

Answer

Correct option: C.
$N_2$ fixation.
In a symbiotic relationship with the soil bacteria known as 'rhizobia' legumes form nodules on their roots (or stems, see figure below) to 'fix' nitrogen into a form usable by plants (and animals). Because legumes form nodules with rhizobia, they have high levels of nitrogen available to them.

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