Specialized cells for fixing atmospheric nitrogen in $Nostoc$ are

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

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Membrane-bound organelles are absent in

Organisms of which of the following kingdom do not have a nuclear membrane?

They play a great role in recycling nutrients like Nitrogen,Phosphorous,iron and sulphur.

In which of the following does oxygenic photosynthesis occur?

The non-nucleated,unicellular organisms of Whittaker's $(1969)$ classification are included in the kingdom

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