Biology reading for 3/25/15 pages 198-201Reproductive adaptations of angiosperms include flowers and fruitsAngiosperms: seed plants with reproductive structures called flowers or fruitsCharacteristics of angiospermsAnthophyta: the one phylum that angiosperms are classified underFlowers and fruits: two key adaptations of angiospermsFlowersFlower: unique angiosperm structure specialized for sexual reproductionFloral organs: sepals, petals, stamens, and carpelsSepals: Located at the base of the flower, usually green and encloses the flower before it opensPetals: attract pollinators, contains stamens and carpelsStamen: produce microspores that develop into pollen grains. Contains the filament and antherFilament: the stalk portion of the stamen that produces pollenAnther: the terminal pollen sac of a stamenCarpels: make megaspores and their productsStigma: located at the tip of the carpel. Receives pollenStyle: leads from the stigma to the ovaryOvary: located at the base of the carpel. Contains one or more ovules and develops into a seed iffertilizedComplete flowers: flowers that have all four organsIncomplete flowers: flowers that lack one or more of the four organsDiversity of flowers differ from adaptations to different pollinators. Radical symmetry in flowers: the flower can be divided into four equal partsBilateral symmetry in flowers: the flower can only be divided into two equal partsFruitsFruit: when the wall of the ovary thickens and the ovary maturesThe angiosperm life cycleGenerative cell and tube cell: two haploid cells contained by male gametophytesTube cell: produces a pollen tubeGenerative cell: divides and forms two sperm Embryo sac: a female gametophyte in the ovaryCross pollination: The transfer of pollen of a flower to a stigma to another flower of the same speciesMicropyle: a pore in the integuments of the ovuleDouble fertilization: one fertilization produces a zygote and another produces a triploid cellCotyledons: a sporophyte embryo with a rudimentary root of one or two seed leavesEndosperm: tissue rich in starch and other food reserves that nourish the developing embryoQuizlet link:
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