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Plant reproduction seed plants

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  • 1. Plant Reproduction: Seed Plants
    8SCIENCE: Mon. March 14th/Tues. March 15th
  • 2. Seed Plants
    Seed plants reproduce sexually
    Fertilization from male and female sex cells
    Two types:
    Gymnosperms
    E.g. Pine trees with cones
    Angiosperms
    E.g. Most have flowers
  • 3. Gymnosperms
    Means ‘naked seed’ = needs the cone to protect it!
    Cones are the reproductive structures on gymnosperms and each species has a different type of cone
    Male and female cones are produced on the same plant:
    Female cones have ovules, which contain the egg cells
    Male cones develop pollen grains, which contain sperm cells
  • 4. Gymnosperms continued…
    Male cones release a cloud of pollen
    Wind usually carries the pollen to the female cone
    The pollen is trapped by a sticky substance and develops into a pollen tube
    Grows towards the ovule and sperm can fertilize the egg cell
    Can take 15 months!
  • 5. Gymnosperms…there’s more!
    After fertilization, an embryo forms and develops into a seed
    When female pine cones mature, they open and release their seeds
    These can be carried away, or are eaten or buried by animals
    Buried seeds may grow into new pine trees!
  • 6. Angiosperms
    All produce flowers
    Can be brightly colored or have a nice smell to attract animals
    Animals like birds (hummingbirds) or insects (bees) can help spread pollen to other flowers
    When pollen from the stamen lands on the stigma, this is called pollination
    The same process occurs in gymnosperms, where a pollen tube grows into the ovule and eventually a seed will develop)

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