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Transcript
REPRODUCTION OF FLOWERING PLANTS Copyright © 2009 Pearson Education, Inc. The flower is the organ of sexual reproduction in angiosperms – Sepals—enclose and protect flower bud – Petals—showy; attract pollinators – Stamens—male reproductive structures – Carpels—female reproductive structures The flower is the organ of sexual reproduction in angiosperms A stamen has two parts – Anther—produces pollen, which house cells which develop into sperm – Filament—elevates anther A carpel has three parts – Stigma—site of pollination – Style—“neck” that leads to ovary – Ovary—houses ovules, which contain developing egg The development of pollen and ovules culminates in fertilization Pollination – Transfer of pollen from anther to stigma – Pollen is carried by wind, water, and animals Copyright © 2009 Pearson Education, Inc. The flower is the organ of sexual reproduction in angiosperms Angiosperm life cycle overview – Fertilization occurs in the ovule; the fertilized egg develops into an embryo encased in a seed – The ovary develops into a fruit, which protects the seed and aids in dispersal – The seed germinates under suitable conditions to produce a seedling, which grows into a mature plant Ovary, containing ovule Mature plant with flowers, where fertilization occurs Ovary, containing ovule Embryo Fruit (mature ovary), containing seed Mature plant with flowers, where fertilization occurs Seed Ovary, containing ovule Embryo Fruit (mature ovary), containing seed Seed Mature plant with flowers, where fertilization occurs Germinating seed Ovary, containing ovule Embryo Fruit (mature ovary), containing seed Seed Mature plant with flowers, where fertilization occurs Seedling Germinating seed Foliage leaves Cotyledon Cotyledon Cotyledon Seed coat