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Pick up graded work Add to TOC and set up Notes: Plant Reproduction HW: Flower Coloring Sheet BYOD Color of the day is Phones are in put away in backpacks
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Flowers allow some plants (angiosperms) to reproduce w/out water
Plant Reproduction Flowers allow some plants (angiosperms) to reproduce w/out water
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Most flowers have 4 basic parts.
petals pistil/ carpel stamen sepals
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Some floral structures are nonessential; they are not required for reproduction.
petals colorful, protect reproductive structures, attract pollinators sepals leaf-like structures which protect the flower before blooming
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Some floral structures are essential for reproduction to occur.
stamens male organs, produce sperm in pollen grains pistil/ carpel female organ, produces egg(s)
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Stamens are made of 2 parts.
anther produces pollen filament supports anther
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Pistils ( ) are made of 3 parts.
stigma Receives/catches pollen style connects stigma to ovary ovary produces egg(s)
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Identify the structures in this flower.
petal stigma pistil style anther stamen filament Where is the ovary? Where are the sepals?
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Inside every pollen grain are two sperm cells.
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When pollen lands on the stigma, this process is called pollination.
A pollen tube grows from the pollen grain and the sperm migrate to the egg. The first sperm fertilizes the egg.
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Pollinators include insects, birds, and wind.
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Flowers & Pollinators Wind pollination - not very efficient; produce vast amounts of pollen; ex. Oak trees Most angiosperms are pollinated by animals which carry pollen from one flower to another.
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Animal-pollinated plants have traits, such as bright colors and sweet nectars.
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The egg and sperm unite in a process called fertilization.
The two cells (egg and sperm) become one new cell called a zygote. The zygote begins to grow and develops into a seed. zygote zygote
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As the seed develops, the ovary grows into a fruit.
This means that anything you eat with a seed(s) is a ripened ovary.
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Different fruits Fleshy fruits - apples, grapes, melons, tomatoes, squash, cucumbers Dry fruits – peanuts, walnuts, wheat, barley, corn, rice
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Examples of ripened ovaries.
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Which of these are fruits (ripened ovaries)?
Hint: If it has a seed, it’s a fruit.
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Seed Dispersal By animals – Seeds contained in sweet, fleshy fruits.
Seeds are covered with tough, protective coatings
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By wind & water Seeds are typically lightweight
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Seeds with wings
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Seeds with spikes
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