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chapter 27 - Chapter 27 The Plant Kingdom Seedless Plants...

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November 01, 2010 Chapter 27 The Plant Kingdom : Seedless Plants Adaptations of Plants • Features of plants that has allowed them to colonize cuticle - covers the aerial portion of a plant • helps prevent desiccation, or drying out stomata - tiny spores which dot the surfaces of leaves and stems of almost all plants • facilitate gas exchange gametangia - sex organs of most plants are multicellular • egg develops into a multicellular embryo The plant life cycle alternates haploid and diploid generations alternation of generations • plants spend part of their lives in a multicellular haploid stage and part in a multicellular diploid stage gametophyte generation -haploid portion of the life cycle ; gives rise to haploid gametes by mitosis • when two gametes fuse, the diploid portion of the life cycle called sporophyte generation begins • sporophyte generation produces haploid spores by the process of meiosis antheridia - male gametangia archegonia - female gametangia • One sperm fertilizes one egg called a zygote • diploid zygote is the first stage in the sporophyte generation
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