Specialized cells for fixing atmospheric nitrogen in Nostoc are 

  • Option 1)

    Akinetes 

  • Option 2)

    Heterocysts 

  • Option 3)

    Hormogonia 

  • Option 4)

    Nodules 

 

Answers (1)
V Vakul

As we learnt in

Cyano bacteria / Blue green algae -

  • Gram negative, photosynthetic, prokaryotes.
  • Contain chlorophyll – a, carotene, phycobilin.
  • Cell membrane lacks sterol.
  • Reserve food material is cyanophycin protein, Cyanophycean starch, lipid globules.
  • Non flagellate, moment by gliding motion,
  • Some of them can fix atmospheric nitrogen in heterocysts.

Eg. Nostoc and anabaena,

- wherein

Eg. Trichodesmium erythreum, Nostoc commune.

 

 

Correct option is 2.


Option 1)

Akinetes 

Incorrect

Option 2)

Heterocysts 

Correct

Option 3)

Hormogonia 

Incorrect

Option 4)

Nodules 

Incorrect

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