Chapter 30 Plant diversity 2, The evolution of seed plants...

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Gametophytes mature within sporophyteMegaspores grow into female gametophytesMicrospores grow into male gametophytesSeed plants are heterosporousBoth tiny gametophytes mature within sporophyteThis is good because the sporophyte can provide protection and nutrientsSpores are not released from sporangiaReproductive adaptationsMegaspore matures to female gametophyteEgg produced and fertilized within ovuleAll gymnosperms and angiosperms contain seedsOvule : derived from a megasporangium on a SporophyllRetains microspores while they matureMicrosporangiumMature male gametophytesPollen grainsNew step in sexPollen grain then grows new pollen tube towards egg in ovulePollen grains travel thru air to reach ovule bearing parts = pollinationPollenFertilization occurs within ovuleNo flagella in the sperm of conifers and angiospermsIncludes embryo, food supply, seed coatDevelops from fertilized ovuleSeed

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Term
Spring
Professor
vaughun
Tags
Plants, Evolution, Ovule, Pollen, Spore, sporophylls

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