Which of the following biological associations does NOT qualify as an example of symbiosis?
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Answer: B. Marchantia sporophyte and gametophyte
Explanation
The Marchantia sporophyte depends entirely on its gametophyte for nutrition and physical support. This intimate maternal dependency resembles a parasitic relationship rather than mutual symbiosis. Nutrients flow from the independent gametophyte to nourish the developing dependent sporophyte. Bryophytes exhibit alternation of generations with dominant photosynthetic gametophyte stages. Symbiosis describes mutually beneficial biological interactions between different species. Marchantia represents a classic liverwort genus studied in introductory botany courses.
Evolutionary biologists analyze bryophyte life cycles to understand early land plant transitions. Parasitic dependency within plant generations contrasts sharply with cooperative fungal partnerships. Educational specimens of liverworts clearly demonstrate attached dependent sporophyte structures. Rhizobium bacteria and leguminous plants form a classic mutualistic symbiotic nitrogen-fixing association. Lichens represent a well-known symbiotic partnership between algae and fungi. Mycorrhizal fungi and tree roots engage in mutually beneficial nutrient-sharing symbiosis.
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