Mutualistic symbionts aiding plants in absorbing phosphorus and trace micronutrients like zinc and copper include.
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Answer: C. Fungi
Explanation
Mycorrhizal fungi form mutualistic symbiotic associations with plant roots. These fungal networks greatly aid plants in absorbing phosphorus and trace micronutrients. In return, the plant supplies the symbiotic fungi with photosynthetically derived sugars. Symbiosis involves close ecological interactions between two different biological species. Fungal hyphae increase the effective surface area of plant root systems exponentially. Micronutrients like zinc and copper are difficult for plants to extract from poor soils alone.
Forest ecosystems rely heavily on fungal symbionts for nutrient cycling and tree survival. Agricultural practices that preserve soil fungi improve crop yields without heavy fertilizer use. Plant health depends on these underground partnerships in nutrient deficient natural soils. Bacteria fix nitrogen rather than primarily providing mutualistic phosphorus and trace minerals. Viruses are generally pathogenic and do not form helpful nutrient absorbing root symbioses. Cyanobacteria form associations like lichens, but fungi are the classic mycorrhizal root symbionts.
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