| Bacteria | Cyanobacteria |
| $(1)$ Cells are smaller. | $(1)$ Cells are comparatively larger. |
| $(2)$ Cell wall is $1-2$ layered. | $(2)$ Cell wall is four-layered. |
| $(3)$ They may possess flagella. | $(3)$ They lack flagella. |
| $(4)$ They are autotrophic and heterotrophic. | $(4)$ They are primarily autotrophic. |
| $(5)$ Autotrophic bacteria contain bacteriochlorophyll. | $(5)$ They possess chlorophyll-$a$ as found in eukaryotic autotrophs. |
| $(6)$ Photosynthesis is anoxygenic. | $(6)$ Photosynthesis is oxygenic. |
| $(7)$ They may be aerobic or anaerobic. | $(7)$ They are aerobic. |
| $(8)$ The reserve food is glycogen. | $(8)$ The reserve food is cyanophycean starch. |
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