- Cyanobacteria refer to the unicellular, colonial or filamentous, marine or terrestrial algae currently classified as eubacteria.
- It is having chlorophyll-like green pigments and is similar to a photosynthetic autotroph.
- A gelatinous sheath typically surrounds this bacterium's colonies. The membranous extensions (specialized compartments) of a cyanobacterium contain pigments known as chromatophores, which are essential for photosynthesis.
Hence, the correct answer is option 1.
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