TAMU BIOL 101 - 08-wk-03-flowers-fruit-seed-hormones-tropisms (36 pages)

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08-wk-03-flowers-fruit-seed-hormones-tropisms



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08-wk-03-flowers-fruit-seed-hormones-tropisms

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Pages:
36
School:
Texas A&M University
Course:
Biol 101 - Botany

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Biology 101 Fall 2008 Week 3 Flowers Flower parts Flower parts are arranged in 4 whorls 1 The gynoecium female 1 stigma 1 The gynoecium female carpel pistil style ovary Flower parts are arranged in 4 whorls 2 The androecium male Flower parts are arranged in 4 whorls 2 The androecium male filament stamen anther 2 Flower parts are arranged in 4 whorls 1 The gynoecium female 2 The androecium male 3 The corolla petals Flower parts are arranged in 4 whorls 3 The corolla petals Flower parts are arranged in 4 whorls 1 The gynoecium female 2 The androecium male 3 The corolla petals 4 The calyx sepals 3 4 The calyx sepals Flower parts are arranged in 4 whorls 1 The gynoecium female 2 The androecium male 3 The corolla petals 4 The calyx sepals All four whorls are attached to the receptacle corolla androecium receptacle calyx gynoecium 4 stigma anther style stamen androecium filament pistil gynoecium ovary carpels ovule petals corolla receptacle sepals calyx peduncle corolla perianth Flowers FLOWERS FRUITS and SEEDS Angiosperms vessel seeded vessel gynoecium carpel pod ovary 5 Central cell nuclei Inflorescence Types 6 Gynoecium Perigynous receptacle Ovules attached to placenta of ovary Placentation pattern of ovule attachment free central axile parietal CARPEL Carpel derived evolutionarily from leaves Gynoecium types Simple Complex 7 OVULE ovule functions as megasporangium megagametophyte embryo sac MEGASPOROGENESIS ovule megasporangium nucellus megaspore mother cell 2N meiosis 4 megaspores 1N MEGAGAMETOGENESIS functional megaspore 3 mitotic divisions eight nuclei 2 polar nuclei 3 antipodal cells 2 synergids 1 egg 8 DOUBLE FERTILIZATION pollen tube penetrates micropyle one sperm fuses with egg cell 2n zygote one sperm fuses with polar nuclei triploid 3n endosperm Biology 101 Fall 2008 Fruit and Seed SEED mature fertilized ovule mitotic divisions of zygote embryo endosperm other nutritive tissues embryo seed coat 9 The endosperm and parental tissues from the carpel together



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