Gymnosperms are plants which bear seeds, including conifers, e.g., evergreen trees. They don’t have structures covering the seed. They originated in the paleozoic era and have different sexes which can be produced on the same plant, monoecism, or produced on different ones, dioecism. This is just an overview. The cited link, provided by washington.edu, carries more in-depth information.
The name gymnosperm means “naked seed.” These plants have exposed seeds, such as those in pine cones. Their opposite is angiosperms whose name means “vessel seed.” These plants produce flowers in which the seeds are contained. These flowers and seeds will produce fruit after reproduction.
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