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Chptr 24 BI 111

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Tristan Long

Chapter 24 13-03-03 1:59 PM alternation of generations: the regular alternation of mode of reproduction in the life cycle of an organism, such as the alternation between diploid (sporophyte) and haploid (gametophyte) phases in plants. Sporophyte: an individual of the diploid generation produced through fertilization in organisms that undergo alternations of generations; it produces haploid spores. Gametophyte: an individual of the haploid generation produced when a spore germinates and grows directly by mitotic divisions in organisms that under go alternation of generations. Poikilohydric: having little control over internal water content. P 550 Xylem: the plant vascular tissue that distributes water and nutrients. Phloem: the food conducting tissue of a vascular plant. Ovule: in plants, the structure in a carpel in which female gametophyte develops and fertilization takes place. Seed: the structure that forms when an ovule matures after a pollen grain reaches it and a sperm fertilizes the egg Coevolution: the evolution of genetically based, reciprocal adaptations in two or more species that interact closely in the same ecological setting List the defining characteristics of land plants, and how these characteristics are different from those found in other eukaryotic groups They are eukaryotes Almost all are photoautotrophs Multicellular Have cell walls All are sessile (stationary) No terrestrial animals are sessile, but some aquatic ones are Has a very different life cycle than animals (alternation of generations) Explain the basic pattern of the plant life cycle, and the steps involved (see Fig 24.1) 1. meiosis produces spores (plant produces haploid seed) 2. spores germinate, it divides by mitosis to produce multicellular haploid gametophyte (baby haploid plant) 3. gametophytes give rise to haploid gametes (baby plant makes ovule and sperm) 4. fertilization of gametes occurs 5. a zygote is produced and develops the plant into a “sporophyte” and the zygote produces seeds. 7. produces spores through meiosis. Explain the evidence in support of the hypothesis that land plants and charophytes shar
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