Angiosperm - Phylum Anthophyta Angiosperms Characterized by...

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Unformatted text preview: Phylum Anthophyta Angiosperms Characterized by: Flowers Seeds produced within fruits Figure 30-26 Land plants Vascular plants Seed plants Gymnosperms Green algae Nonvascular plants Seedless vascular plants Heterospory Fruit Flowers Seeds Pollen Heterospory Sporophyte-dominated life cycle Alternation of generations Retention of embryo on parent Complex gametangia Thick-walled spores Retention of egg on parent Simple gametangia R e d a l g a e U l v o p h y t e s C o l e o c h a e t e s S t o n e w o r t s L i v e r w o r t s H o r n w o r t s M o s s e s L y c o p h y t e s W h i s k f e r n s H o r s e t a i l s F e r n s C y c a d s G i n k g o R e d w o o d s e t a l . G n e t o p h y t e s P i n e s e t a l . A n g i o s p e r m s Figure 40-4a Basic parts of a flower Carpel Stigma Style Ovary Receptacle Anther Filament Petal Sepal Stamen The flower is the reproductive organ of angiosperms. It is a modified branch, and the floral appendages are modified leaves. Pistil Flower parts & their function • Pedicel — attaches flower to stem • Receptacle — enlarged tip of the pedicel for attachment of floral appendages • Sepals — enclose & protect the flower bud • Petals —a ttract pollinators • Stamens — male reproductive organs (microsporophylls) composed of an anther that produces pollen and a filament that elevates the anther • Pistil (s) — female reproductive organ (s) composed of a stigma that receives pollen, a style that elevates the stigma, and an ovary that contains one or more ovules that produce eggs Pistil origin from carpels (megasporophylls) • the individual units of a pistil are carpels , which are megasporophylls . • Carpels may have originated as specialized leaves (megasporophylls) that possessed megasporangia along their outer margins. • Through progressive folding and subsequent fusing of the margins of the megasporophyll, an enclosed pistil evolved. • A pistil may be simple i.e. composed of a single carpel or compound i.e. composed of more than one carpel. • The number of carpels that comprise a pistil can usually be determined by counting the number of stigmas, styles, or ovary segments. Compound pistil Simple pistil Figure 30-16 FERTILIZATION Gametophyte ( n ; multicellular, haploid) M I T O S I S M E I O S I S Sporophyte (2 n ; multicellular, diploid) Spores ( n ) Haploid ( n ) Diploid (2 n ) M I T O S I S M I T O S I S Gametes ( n ) Zygote (2 n ) Alternation of generations life cycle Figure 40-2b Angiosperms: Sporophyte is large and long lived; gametophytes are small (microscopic) and short lived.Angiosperms: Sporophyte is large and long lived; gametophytes are small (microscopic) and short lived....
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This note was uploaded on 03/06/2011 for the course BIOL 100A taught by Professor Barbaraveno during the Fall '08 term at California State University Los Angeles .

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Angiosperm - Phylum Anthophyta Angiosperms Characterized by...

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