The gymnosperms are called 'Naked Seeded' plants because they bear naked:

Explanation

Explanation:The term gymnosperm literally means naked seeds. The ovules in these plants are usually borne on exposed surfaces of fertile leaves. These ovules unlike those of angiosperms are not enclosed but lie naked on the surface of fertile leaves. Antheridia are structures in plants that produce and contain male gametes (sperm). They are not directly related to the term "naked seeded" used to describe gymnosperms. Gymnosperms donot produce fruits, which are the defining characteristic of angiosperms. Archegonia are structures in plants that produce and contain female gametes (eggs). They are not directly related to the term "naked seeded" used to describe gymnosperms.