Which of the following are the part or example of symbiotic mutualistic association?
$I.$ Yeast
$II.$ Rhizobium
$III.$ Mycorrhiza
$IV.$ Oscillatoria

  • A
    $I$ and $II$
  • B
    $I$ and $III$
  • C
    $II$ and $III$
  • D
    $III$ and $IV$

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Rhizobium lives symbiotically with root nodules and fixes atmospheric nitrogen. It provides nitrogenous compounds to the host and in turn takes food from the host. This food taken by the bacterium is:

Symbiotic nitrogen-fixing bacterium is . . . . . . .

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