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Tracheophyta : the seed plants

Tracheophyta : the seed plants. Two different kinds. Gymnosperms: have an unprotected seed (naked in cone like structures) Angiosperms: seeds are enclosed and protected inside a fruit. Adaptations of seed plants. Can reproduce without water (wind or other creatures can carry genetic material)

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Tracheophyta : the seed plants

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  1. Tracheophyta: the seed plants

  2. Two different kinds • Gymnosperms: have an unprotected seed (naked in cone like structures) • Angiosperms: seeds are enclosed and protected inside a fruit

  3. Adaptations of seed plants • Can reproduce without water (wind or other creatures can carry genetic material) • There are separate male and female gametophytes

  4. Gymnosperms • Have thin, needle like leaves (covered by a waxy cuticle) • Roots extend over a wide surface area to hold the tree firmly in one place and access a lot of nutrients/water from the soil • Tend to live in colder/harsher climates • Ex: Evergreen trees!

  5. Angiosperms • Have flowers (known as flowering plants) for attracting pollinators (like insects or birds) • Flowers have both male and female structures • Male (Stamen): • Anther :produces pollen • Filament: thin stalk that holds anther out of the flower • Female (Carpel/Pistil) • Stigma: where pollen gets deposited • Style: a slender stalk leading from stigma to the ovary • Ovary: contains ovule (egg cell)

  6. Make sure you know the life cycles of seed plantspg 266 and pg 269

  7. Coevolution • Some specific insect or animals are attracted to the nectar in specific flowers (and will thus pollinate them) • It is believed they evolved together: plant feeding insect while insect helps plant reproduce • Madagascar hawkmoth and orchid

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