7. Reproduction in flowering plants - Part 2
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7. Reproduction in flowering plants - Part 2






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7. Reproduction in flowering plants - Part 2 7. Reproduction in flowering plants - Part 2 Presentation Transcript

  • Reproduction in Flowering Plants
  • Flower • Sexual reproductive structure • Produces egg and sperm • Fertilization takes place inside the flower
  • Pollen is produced in the male organs of the flowers - anthers. Pollination occurs when pollen is transferred from the anthers to the female organs by wind or by animals. If the female stigma is receptive to a pollen grain, the pollen produces a pollen tube, which grows through the female tissue to the egg, where fertilization takes place by the sperm nucleus.
  • Female reproductive organ Pistil *Stigma –top of the pistil, Sticky surface for pollen to stick to *Style – connects the stigma to the ovary *Ovary –contains ovules ( eggs) Male reproductive organ Stamen *Anther – produces sperm nuclei by meiosis. Sperm nuclei are enclosed by pollen grains. *Filament – holds the anther up
  • Pollination • Transfer of mature pollen grains from the anther to the stigma -wind -insects -birds & other animals
  • • When a pollen grain lands on the stigma, it germinates and a pollen tube grows down through the style to an ovule (egg)
  • Fertilization • The sperm travels through the pollen tube to the ovule. The sperm & egg fuse forming the zygote (fertilized egg) –this grows into the plant embryo (cells grow by mitosis)
  • *Self pollination –pollen from same flower *Cross pollination – pollen from a different flower - more variation
  • • The ovary and zygote (fertilized ovule) develop and ripen. *The ovule forms the seed and the ovary forms the fruit. • A fruit is a ripened ovary
  • The plant embryo uses food stored in the cotyledon of the seed until it develops leaves for photosynthesis
  • Seedling micropyle –opening in ovule where pollen tube attached, sperm entered hilum –scar where ovule attached to ovary radicle –embryonic root
  • Epicotyl – grows above the cotyledons and gives rise to the leaves. Hypocotyl –below the point of attachment of the cotyledon, develops into the stem.
  • Parts of a seed • Dicot Seed coat Hypocotyl Epicotyl Cotyledons Endosperm • Monocot Seed coat Epicotyl Hypocotyl Cotyledon Radicle
  • Seed Germination Monocot Dicot Epigeous Hypogeous Radicle