Question

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

• A. An epiphytic relationship with the alga
• B. A parasitic relationship with the alga
• C. A symbiotic relationship with the alga
• D. A saprophytic relationship with the alga

Answer 1

Answer: (C)

A symbiotic relationship with the alga

Answer 2

Lichens represent a mutualistic partnership between Algae and Fungi. The term "Lichen," coined by Theophrastus, translates to "independent plants," reflecting the unique nature of this relationship. It's also referred to as mutual because both organisms benefit in some way from this association. The dominant partner in this relationship is the fungal component, known as the mycobiont, constituting approximately ninety-five percent of the lichen structure. In contrast, the algal partner, referred to as the phycobiont, makes up only about five percent of the lichen. Within lichens, the fungus relies on the algae for nourishment since fungi are incapable of performing photosynthesis. In return, they provide shelter and a habitat for the algae. In summary, lichens exemplify a well-known synergy between an alga and a fungus, where the fungus engages in a symbiotic relationship with the alga.