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Angiosperms are flowering plants where the seeds are found in an ovary. Gymnosperms are evergreen plants where the seeds are naked, as in without an ovary. In angiosperms the pollen from the anther or male part of the plant ir released and when it lands on the stigma it travels into the ovary to fertilize an ovule. The seeds will develop inside the ovary which in plants like tomatoes or apples will become the fruit surrounding the seeds.
A major distinction we can make between seed plants (gymnosperms and angiosperms) and the non-seed plants (mosses and ferns) is that seed plants are heterosporous and non-seed plants are homosporous. Back to the example of a gymnosperm, the pine tree.his type of unprotected seed is a naked seed. The name gymnosperm means naked seed.. In contrast, seeds of angiosperms are enclosed in a special structure that at maturity is called the fruit. There are going to be more new terms for you to learn as development of seeds of gymnosperms and angiosperms is considered.