Heterocyst is found in

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(B) Heterocysts are specialized,thick-walled cells found in certain filamentous cyanobacteria such as $Nostoc$ and $Anabaena$.These cells are speciali

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Nostoc

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(B) Heterocysts are specialized,thick-walled cells found in certain filamentous cyanobacteria such as $Nostoc$ and $Anabaena$.These cells are specialized for the process of nitrogen fixation because they provide an anaerobic environment necessary for the enzyme nitrogenase to function,as it is sensitive to oxygen.$Methanogens$ are Archaebacteria,$Gonyaulax$ is a dinoflagellate (Protista),and $Euglena$ is a flagellated protozoan (Protista).Therefore,the correct option is $B$.

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