Inaddition, seed plants produce much of the oxygen you breathe. Seed plants share two important characteristics. Theyhave vascular tissue, and they use pollen and seeds to repro-duce. In addition, all seed plants have body plans that includeroots, stems, and leaves.Like seedless plants, seed plants havecomplex life cycles that include the sporophyte and the game-tophyte stages.In seed plants, the plants that you see are thesporophytes.ketches should include the seed coat, the cotyledons, and the embryo.Extend Invite students to repeat the activity with other kinds of seeds. learning modality: kinesthetic How Seeds Become New Plants All seeds share important similarities. Inside a seed is a partiallydeveloped plant.