Unformatted text preview: The ferns are the only spore-dispersing vascular plants that have functional megaphylls. As with all vascular plants, the dominant generation for the seed plants is the sporophyte generation. All seed plants are heterosporous. Heterospory often ensures greater genetic variation for sexual reproduction, providing for enhanced survival in changing or different environments. Both male and female gametophytes are dependent upon the sporophyte and female gametophytes are retained by the sporophyte plant until the seeds (of the next sporophyte generation) are mature. Seed Plant Traits Seed plant fossils date back about 350 million years....
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- Fall '09