311DCh30 - Ch. 30 pg. 618 635; 593 Nearly all seedless...

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Ch. 30 pg. 618 – 635; 593 Nearly all seedless plants are Homosporous, which usually gives rise to a bisexual gametophyte; seed plants are Heterosporous Integuments – layers of sporophyte tissue envelop and protect the megasporangium
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Gymnosperm megaspores have one integument versus angiosperms having two Ovule – contains a megasporangium, megaspore, and integument(s) – inside the ovule, a female gametophyte develops from a megaspore and produces one or more egg cells Pollen grains – microspores develop into pollen grains, which contain male gametophytes of seed plants; protected by coat of polymer Sporopollenin Pollination – transfer of pollen to part of seed plant containing ovules Seed – consists of embryo, food supply, packaged within a protective coat derived from integuments Gymnosperms are “naked seeds” that are not enclosed in ovaries; seeds exposed on modified leaves that usually form cones (Strobili); conifers – cone bearing trees including pine, fir, and redwood; needle shaped leaves with thick cuticles, and relatively small
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This note was uploaded on 02/01/2011 for the course BIO 311D taught by Professor Reichler during the Spring '08 term at University of Texas.

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311DCh30 - Ch. 30 pg. 618 635; 593 Nearly all seedless...

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