Specialized cells for fixing atmospheric nitrogen in $Nostoc$ are

  • A
    Archegoniophore
  • B
    Heterocysts
  • C
    Hormogonia
  • D
    Pellicles

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Assertion $A$: Some bacteria possess unique phenotypic characters.
Reason $R$: Many bacterial cells contain plasmid $DNA$ in addition to genomic $DNA$.
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