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The plant kingdom consists of four major groups: the nonvascular plants, the seedless vascular plants, the gymnosperms and the angiosperms. The nonvascular plants, such as mosses and liverworts, are one of the simplest groups of the true plants.
Gymnosperms, therefore, as exemplified by pine trees, are heterosporous. 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.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.