PlantKingdom213-page7

PlantKingdom213-page7 - characteristics that distinguish...

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Introduction to the Plant Kingdom - 7 Plant Life History - The Alternation of Generations As previously studied, the life history of all plants involves an alternation of a haploid phase (the Gametophyte) that produces gametes in protective structures called gametangia, with a diploid phase (the Sporophyte) that produces sporangia, structures in which meiosis occurs. To start our discussion of plants, we will review the alternation of generations. Variations in life history are essential to classification in the Plant Kingdom, and we will explore a few now, along with some of the
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Unformatted text preview: characteristics that distinguish plant groups in evolutionary development before turning the specifics of each plant taxon. * Variations in Life History Patterns • Sporangia: Homosporous or Heterosporous (see later) • Prevalence (predominance) of sporophyte or gametophyte. More complex plants = more sporophyte dominance • Independence or dependence of Sporophyte or Gametophyte on alternate generation. More advanced plants have a dependent gametophyte....
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