Gymnosperm & Angiosperm - Brookings High School PDF
Preview Gymnosperm & Angiosperm - Brookings High School
Gymnosperm & Angiosperm Rise of the seed plants AP Biology 2004-2005 27 Gymnosperm: conifers Characteristics vascular heterospory male vs. female gametophytes seeds naked seeds (no fruit) pollen contain male gametophyte life cycle dominated by sporophyte stage coniferous trees you are familiar with are diploid reduced (microscopic) gametophyte reduction of gametophyte protects delicate egg & embryo in protective sporophyte protected from drought & UV radiation AP Biology 2004-2005 28 Evolutionary trends in land plants Reduction in gametophyte gymnosperm bryophytes pteridophytes angiosperm AP Biology 2004-2005 29 Early Gymnosperm: ginkgo AP Biology 2004-2005 30 Early Gymnosperm: cycads AP Biology 2004-2005 31 Gymnosperm: conifers AP Biology 2004-2005 32 Cones & naked seeds AP Biology 2004-2005 33 Gymnosperm (Pine) life cycle female gametophyte in cone meiosis meiosis male gametophyte in pollen f e r t ili z a t i o n sporophyte in seed AP Biology 2004-2005 34 sporangium & pollen male male (pollen) cones female female cones pine embryo AP Biology 2004-2005 35 Angiosperm: flowering plants Characteristics vascular heterospory male vs. female gametophytes flower specialized structure for sexual reproduction seeds within fruit pollen life cycle dominated by sporophyte stage trees & bushes you are familiar with are diploid reduced (microscopic) gametophyte AP Biology 2004-2005 36
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