The gametophyte generation of Psilopsida establishes a mutualistic symbiosis with______________?
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Answer: D. Fungus
Explanation
The gametophytes of primitive vascular plants like Psilopsida form symbiotic relationships with fungi. This underground association provides essential nutrition and water absorption for the developing gametophyte. Fungal partners penetrate the gametophyte tissue to facilitate nutrient exchange in nutrient-poor soils. Algae are photosynthetic aquatic organisms that form lichens rather than partnering with Psilopsida. Bacteria form nitrogen-fixing symbioses with certain legumes rather than primitive fern allies. Protozoa are single-celled eukaryotes that typically do not establish mutualistic gametophyte symbioses.
Mycorrhizal and similar fungal associations played a crucial role in early plant land colonization. Primitive plants often rely heavily on fungal partners because they lack true roots. Botanists study these ancient symbioses to trace the evolutionary history of vascular plants. Algae partner with fungi to form lichens rather than associating with Psilopsida gametophytes. Bacteria associate with root nodules of flowering plants instead of primitive fern allies. Protozoa do not engage in the specialized nutritional symbiosis exhibited by these fungi.
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