tracheophyta : the seed plants
DESCRIPTION
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) - PowerPoint PPT PresentationTRANSCRIPT
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Tracheophyta: the seed plants
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Two different kinds• Gymnosperms: have an unprotected seed
(naked in cone like structures)• Angiosperms: seeds are enclosed and
protected inside a fruit
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Adaptations of seed plants
• Can reproduce without water (wind or other creatures can carry genetic material)
• There are separate male and female gametophytes
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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!
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Angiosperms• Have flowers (known as flowering plants) for
attracting pollinators (like insects or birds)• Flowers have both male and female structures• Male (Stamen):
o Anther :produces polleno Filament: thin stalk that holds anther out of the
flower• Female (Carpel/Pistil)
o Stigma: where pollen gets depositedo Style: a slender stalk leading from stigma to
the ovaryo Ovary: contains ovule (egg cell)
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Make sure you know the life cycles of seed
plantspg 266
and pg 269
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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