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Lichens are dual organisms resulting from a partnership between a fungal component and a photosynthetic organism. The fungal partner primarily forms the structure of the lichen, while the photosynthetic partner provides nourishment.

1. Lichens are dual organisms created through a symbiotic relationship between a fungus and an alga. Saprophytes feed on decaying organic matter, epiphytes grow on other plants, and parasites live within their hosts.
2. The fungal component of lichens is usually from the Ascomycota group, occasionally from Basidiomycota. The photosynthetic partner, either algae or cyanobacteria, produces organic sugars by fixing carbon dioxide, benefiting both partners. Water and nutrients are absorbed from the environment.
3. In some lichens, cyanobacteria may be present as the main photosynthetic partner or alongside green algae in tripartite lichens. Cyanobacteria can fix atmospheric nitrogen, complementing the role of green algae.
4. Lichens are dual organisms formed by the partnership of a fungus and a photosynthetic partner. The majority of the lichen's structure is made up of fungal tissue.

Correct answer: Lichens are dual organisms formed by the partnership of a fungus and a photosynthetic partner. The majority of the lichen's structure is made up of fungal tissue.

Solution

Option (d) is correct because it accurately describes lichens as composite organisms formed by the association of a fungus and a photosynthetic symbiont, with the bulk of the lichen body being formed by the fungus.

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