The given figure shows the structure of filamentous blue-green algae,Nostoc,with a structure marked as $X$. Select the option which shows the correct identification of $X$ with its feature.

  • A
    Spores - Reproduction
  • B
    Heterocysts - Nitrogen fixation
  • C
    Pellicle - Recycling of nutrition
  • D
    Mucilaginous sheath - Photosynthesis

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