angiosperms and gymnosperms
TRANSCRIPT
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2 Types of Seed Plants
• Angiosperms
• Gymnosperms
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Gymnosperms
• Have cones for reproduction instead of flowers
• 4 Types – Cycad– Ginkgo– Conifer– Gnetophyte
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Gymnosperms
• Cycads: look like ferns except they have seeds
• Ginkgo: very large trees found mainly in China
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Gymnosperms
• Conifers: seeds are in cones or berrylike structures
• Gnetophytes: shrubs and climbing vines
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Angiosperms
• Largest group of plant in the world• Found in all types of climates• Produce flowers for reproduction
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Angiosperms
• Parts of the flower:– Sepals– Petals– Stamen– Pistil
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Sepals
• The sepals protect the flower before it opens.
sepal
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Petals
• The petals attract pollinating insects with their bright color and attractive scent.
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Male Parts• The stamens
are the male structures of the flower.
• Made up of two parts:– Anther– Filament
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Male Parts• Anther: top
part of the stamen, that makes pollen.
• Filament: this is the stalk of the Anther
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Female Parts• Pistil is the
female structure of flower that has 3 parts:– Stigma– Style– Ovary
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Female Parts
• Stigma:– The pollen from
another flower collects on the stigma’s sticky surface.
• Style:– raises the stigma
away from the Ovary
stigma
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Female Parts
• Ovary protects the ovules(egg).
• Once fertilization has taken place it will become the fruit.
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Write the correct words in the boxes:stamens, stigma, petals, ovary, sepals
these attract insects
4
where the pollen is made
pollen sticks to this 5
2
where the seeds grow
1
These protect the flower before it opens 3
Write the correct words in the boxes:stamens, stigma, petals, ovary, sepals
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PLANT REPRODUCTION
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Plants Reproductive Structures
• Cones: Gymnosperms– Female cones contain the ovules
which contains the egg cell– Male cones contain pollen which are
like sperm cells
• Flowers: Angiosperms– Pistil: female part of flower– Stamen: Male part of flower
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Pollination
• Insects visit flowers to search
for nectar – their food.
• But the flowers use the insects for their own purposes!
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• As the insect probes for nectar, its body rubs against the stamens.
• Pollen gets stuck on the insect’s legs.
• You can often see bees with a heavy load of yellow pollen on their hind legs.
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Pollination
When the insect visits another flower of the same type, the pollen will stick to the pistal.
This is called
pollination.
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Fertilization
The pollen travels to the ovary, where it joins with an ovule.
This is called
fertilization.
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Seeds
• Seeds: the fertilized egg
• Seed Structure: consists of a seed coat, a young plant, and stored food
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Types of Seeds
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Types of Seeds
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Seeds
• The seeds develop inside the ovary, which grows to become the seed pod or fruit.
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Seed Dispersal
• The seeds are dispersed; some by animals, some by the wind, some by explosion and some by water.