Plants - mr.pierces.pagemrpierce.weebly.com/uploads/2/4/7/9/2479466/plants.pdf · Plants • Plant...
Transcript of Plants - mr.pierces.pagemrpierce.weebly.com/uploads/2/4/7/9/2479466/plants.pdf · Plants • Plant...
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Plants • Plant Organs
• Plant Reproduction
Reid Pierce
Fulbright Jr. High
Bentonville, AR
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Plant Types
• 2 types of plants
Gymnosperm – produce cones
(reproductive organ)
Angiosperm – produce flowers (reproductive organ)
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Plant Organs
• Roots
– absorb water and nutrients
– anchor plant
– store food (onion, carrot, etc…)
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Plant Organs
• Leaves
– primary location of photosynthesis (any green part can do this though)
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Plant Organs
• Stems
– support
– transport materials
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Plant Organs
• Flowers
– reproduction
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Imperfect Flower
• A flower that has either all male parts or all female parts
• Examples: cucumbers, pumpkin, and melons.
Pumpkin Flower
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Perfect Flower • A flower that has both the male parts and
female parts in the same flower. Examples: roses, lilies, tulips, dandelions, etc…
Tulip
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Male Parts
• Stamen - made up of the filament and anther, the pollen producing part of the plant. The number of stamen is usually the same as the number of petals.
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Male Parts
• Anther - part of the stamen that produces and contains pollen, is usually on top of a long stalk that looks like a fine hair.
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Male Parts
• Filament –the fine hair-like stalk part of the stamen that the anther sits on top of.
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Male Parts of a Flower
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Female Parts
• Pistil - the female part of the flower. It is made up of the stigma, style, ovary, ovule and egg.
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Female Parts
• Stigma - the sticky bulb in the center of the flowers, it receives the pollen grains (when they stick to it)
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Female Parts
• Style - the long stalk that the stigma sits on top of.
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Female Parts
• Ovary - usually at the bottom of the flower, has the seeds inside and turns into the fruit that we eat. The ovary contains ovules.
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Female Parts
• Ovule - the part of the ovary that becomes the seeds.
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Female Parts
• Egg – once fertilized by the pollen, turns into an embryo
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Female Parts
• Pollen Tube – tube that the pollen travels down to reach the ovule
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Female Parts of a Flower
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Other Parts
• Petal – the colorful, often bright part of the flower that attract pollinators
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Other Parts
• Sepal – the parts that look like little green leaves that cover the outside of a flower bud to protect the flower before it opens
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White Oaks have male
and female flowers.
The male flowers are
greenish-yellow catkins,
up to four inches long,
which hang from twigs.
Female flowers are small
reddish spikes.
The fruit of White Oak is
an acorn, growing over
an inch long, with a
warty cap. Many animals
eat these acorns.
The bark of White Oak is
light gray and scaly.
Sometimes it flakes off.
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Scientific name: Ginkgo biloba
This is female flower of a Ginkgo tree. This is an imperfect
flower.
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Scientific name: Ginkgo biloba
This is male flower of a Ginkgo tree. This is an imperfect flower.
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Pollination • how eggs are fertilized
• transfer of pollen from the stamen to the ovules
• 2 Types:
– Self pollination
– Cross pollination
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Self-pollination – when pollen from one flower pollinates its own ovule
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Cross-pollination –
when pollen from a different flower pollinates an
ovule by bees, the wind, floating, attaching to
fur, feathers, clothing, etc…