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Difference between Bacteria and Cyanobacteria

E.coli
Bacteria are unicellular, microscopic and prokaryotic organisms. Most of them are devoid of chlorophyll and lead a heterotrophic mode of life.
Nostoc
Cyanobacteria  (blue green algae) are a group of ancient gram negative photosynthetic prokaryotes. They are one of the most successful groups of organisms that have survived for about three billion years. They can also live in extreme habitats like hot springs and under side of icebergs etc.
See also: Similarities between Bacteria and Cyanobacteria

Bacteria vs Cyanobacteria

No
Character
Bacteria
Cyanobacteria

1
Size
Comparatively smaller
Comparatively larger

2
Flagella
May bear Flagella
Flagella always absent

3
Nutrition
May be autotrophic or heterotrophic.
Usually autotrophic
4
Photosynthetic Pigments
Photosynthetic Pigments are bacteriochlorophyll
Photosynthetic Pigments is chlorophyll a
5
Accessory pigments
Absent
Accessory pigments like phycocyanin and phycoerythrin are present in dominating form.

6
Reserve food
Glycogen
Cyanophycean starch
7
Hydrogen donor
During photosynthesis hydrogen donor is not water; as a result oxygen is not evolved. Thus photosynthesis is anoxygenic.
Hydrogen donor is water, oxygen is evolved. Process is oxygenic.
8
Spore formation
Spore formation is endogenous
Spore formation is not endogenous

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