Lichens are a well known combination of an alga and a fungus

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Lichens are a well known combination of an alga and a fungus where fungus has

1. a saprophytic relationship with the alga
2. an epiphytic relationship with the alga
3. a parasitic relationship with the alga
4. a symbiotic relationship with the alga

Correct Option: D

Lichens are composite organisms formed by symbiotic association between a fungus and alga. A saprophyte is an organism feeding on dead, decaying organic matter. Epiphyte is a plant growing over another plant. Parasites live inside their host.