Which of the following relationship is NOT an example of symbiosis?
Correct answer: B. Marchantia sporophyte and gametophyte
- A. Rhizobium and leguminous plants
- B. Marchantia sporophyte and gametophyte
- C. Algae and fungi in a lichen
- D. Mycorrhizal fungi and tree roots
Explanation
The relationship between a Marchantia sporophyte and gametophyte is an alternation-of-generations relationship within one plant life cycle, not symbiosis between separate organisms. Rhizobium with legumes, algae with fungi in lichens and mycorrhizal fungi with roots are classic close associations between different organisms. Students may choose a because Rhizobium is sometimes described as parasitic in other contexts, but its usual association with legumes is mutualistic symbiosis.
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