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Q. Cyanobacteria

UP CPMTUP CPMT 2003

Solution:

Cyanobacteria share general prokaryotic properties and include unicellular, colonial and filamentous forms. Cyanobacteria are commonly called as blue green algae due to presence of blue green pigment c-phycocyanin, C-phycoerythrin along with chlorophyll ‘a’, $\beta$-carotene and some myxoxanthin. Fossil of blue green algae make up layered formations which are called as stromatolites. These are probably the 1st$O_{2}$ producing organisms to evolve. These are responsible for early accumulation of atmospheric $O_{2}$. It is related to bacteria, their photosynthetic apparatus includes both chlorophyll ',a'carotenoids and phycobiliprotein pigments.