Blue Green Algae also called as Cyanobacteria are one of the most successful organisms on this planet. They are gram-negative (do not take up gram stain) and photosynthetic microorganism. They have successfully survived for over 3 billion years on our planet earth. Initially, they were classified Plantae due to their ability to photosynthesis, but later they were moved to the Monera Kingdom.
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Why they relate to plants to look like them?
If we talk about their external appearance then they quite similar to green photosynthetic algae (kingdom Plantae). Colour of blue green algae ranges from green to deep blue, often blue-green (so does their name suggests). Their color is due to photosynthetic pigments i.e. Chlorophyll and the Phycobilins ( such as phycoerythrin (red) and phycocyanin (blue)).
Thus, we can say that Cyanobacteria or Blue Green Algae are more related to Bacteria (Monera Kingdom) than to Plants (Plantae kingdom). Hence they were moved to the Monera Kingdom from the Plantae Kingdom.
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However, besides Plantae kingdom cyanobacteria have been observed to be associated with almost every type of eukaryotes: green alga, moss, ferns, flowering plants, fungi, protozoa, sponge, shrimps and even mammals.