Botany - Biological Classification Question with Solution | TestHub

The cyanobacteria or blue-green algae ($\mathrm{BGA}$) have chlorophyll-$\mathrm{a}$similar to green plants and are photosynthetic autotrophs. The$\mathrm{BGA}$are unicellular, colonial or filamentous, freshwater, marine or terrestrial algae. The colonies are generally surrounded by a gelatinous sheath. They often form blooms in polluted water bodies. Some of these organisms can fix atmospheric nitrogen in a specialised cells called heterocysts.