the term that describes the pollen grain as the male gametophyte and the egg sack as the female gametophyte, but both are considered separate plants gymnosperm
Unlike angiosperms, or flowering plants, whose seeds are enclosed by fully developed ovaries, or fruits, gymnosperms, or any vascular plant, reproduce by the use of an exposed seed, or ovule. Many gymnosperms bear their seeds in cones, which are known as " seeds" because they are not visible until they are fully developed. Pinophyta, Cycadophyta, Ginkgophyta, and Gnetophyta are the four recognized divisions of extant (nonextinct) gymnospermous plants, with 88 genera and more than 1,000 species spread across the globe.
Between 252.2 million and 66 million years ago, during the Mesozoic Era, gymnosperms dominated, giving rise to some of the modern families.
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