Why are lichens called dual organism

1.	Why are lichens called dual organism
Answer» Lichens are called as dual organisms because they have symbiotic relationship between algae and fungus.Explanation:• Lichens are species that grown from the substrate of fungi in an algae environment• The algae and the fungi are in mutual relationship the algae help them to produce food and the fungus help them to absorb the nutrients• Symbiotic relationship is that the organisms have mutual support and they help each other and they are beneficiary to each other• They are of various size and forms and they are divided into thallus and the filament body parts• Lichens are of variety of colors and this is due to the presence of usnic acid

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