Gymnosperm Defining Trait: the Naked Seed
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A gymnosperm produces a "naked" seed, exposed on a modified leaf structure such as a cone scale, rather than enclosed inside an ovary.
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A pine seed sits exposed on a woody cone scale's surface, with no surrounding fruit tissue covering it.
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"Naked" describes the seed's lack of an enclosing ovary wall, not any lack of a protective coat around the embryo.