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Alga prepares food by photosynthesis and feeds fungus while fungus absorbs water from the plant on which it is growing and protects the alga from the environment . this type feeding is known as symbiosis .

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Yes. Lichen is a symbiotic relatioship between fungi and algae, in which the algae provides energy from photosynthesis, while the fungi fills other roles like providing structure, water retention, or mineral extraction.
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