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Finally, these plants are gametophyte dominant, meaning that the recognizable stage of these plants is the haploid gametophyte generation. The seedless vascular plants, which include ferns and fern allies, possess several adaptations lacking in nonvascular plants.Xylem and phloem are present to efficiently transport water and sugars, respectively throughout the plant body.s photosynthetic autotrophs, plants use solar energy to produce organic compounds from carbon dioxide and water. The plant kingdom consists of four major groups: the nonvascular plants, the seedless vascular plants, the gymnosperms and the angiosperms.
Gymnosperms were the first seed plants. They do not make flowers or fruits though, so their seeds are unprotected. This is how they got their name, which means naked seed.. Even as the seedless vascular plants were having their heyday 300 million years ago, seed plants evolved and started new trends in the plant world. These seed plants had a few characteristics that made them different than the seedless plants, and also more successful in a variety of environments. Evolution by natural selection favors traits that are advantageous for survival and reproduction. Plants with seeds had some major advantages over plants without seeds: â¢ Wind-dispersed pollen doesn't need water for fertilization â¢ The seed protects the embryo from drying out â¢ The seed gives nutrients to the embryo, which helps early plant growth Since sperm no longer need water to fertilize the egg, plants with pollen can reproduce at more times during the year and in drier habitats.