Which of the following cyanobacteria can fix atmospheric nitrogen?

$I.$ Anabaena

$II.$ Oscillatoria

$III.$ Nostoc

Choose the correct option

  • A

    $I \, \& \, II$

  • B

    $II \,  \& \,  III$

  • C

    $I  \, \& \,  III$

  • D

    $I, II  \, \&  \, III$

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  • [AIPMT 2010]

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