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I. Unicellular. Colonial, filamentous, marine or terrestrial forms II. The colonial , filamentous, marine or terrestrial forms III. Some can fix atmospheric nitrogen in specialised cells called heterocysts IV. They often form blooms in water bodies. these above characters are seen inA. ArchaebacteriaB. CyanobacteriaC. ChrysophytesD. Dinoflagellates

Answer» Correct Answer - B
I. Unicellular, colonial, filamentous, marine or terrestrial forms.
II. The colonies are surrounded by a gelatinous sheath.
III. Some can fix atmospheric nitrogen in specialized cells called heterocysts.
IV. They often form blooms in water bodies. These above characters are seen in Cyanobacteria.


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