first five explain the difference between each of the following pairs of words 1. cell membrane,...
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First Five
Explain the difference between each of the following pairs of words1. cell membrane, cell wall
2. osmosis, diffusion
3. enzyme, substrate
4. respiration, photosynthesis
Silently, answer the following question in your notebook:
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AnnouncementsPast Due:
Plant Nutrition PacketRespiratory System PacketCirculatory System Problems
Today:Fill out Guided NotesPlant Reproduction HW is on the final page
Due next class period.
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Plant Reproduction
http://www.youtube.com/watch?v=CkBNEM2mD30
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Plant Reproduction
1. Get your assigned ipad2. Go to my Weebly(ctompkinsasuprep.weebly.com) Coordinated
Science II3. Click on “Classwork: Plant Reproduction”
4. Open the Powerpoint and use it to answer the questions on the handout
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Plant ReproductionFlowers are the reproductive
organs of plants
Many flowers have both male and female reproductive parts
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Structure of a Flower1. Pistil/Carpel
2. Stigma
3. Style
4. Ovary
5. Stamen
6. Filament
7. Anther
8. Petal
9. Sepal
10. Receptacle
11. Stem
Fem
ale R
eproductive S
tructures
Male R
eproductive S
tructures
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Male Reproductive StructureThe stamen consists of
two parts: Anther and Filament
The anther is where meiosis occurs to produce haploid pollen
The filament is a stalk that supports the anther
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• Pollen Grain
• Anther Sac
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Female Reproductive StructureThe pistil (or carpel)
consists of the stigma, style and ovary
Meiosis occurs in the ovary to produce haploid ovules
The sticky stigma receives the pollen (male gamete structure) from the anther
The pollen grows a tube down through the style
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Fertilization
After pollen lands on the stigma, a pollen tube grows down through the style to ovary
The pollen tube passes through the micropyle (opening) into the ovule
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Fertilization
Male gametes travel along the pollen tube and into the ovule
The male gamete fuses with the female gamete – fertilization has taken place
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Seed and Fruit Development After fertilization,
the petals and sepals fall off flower
Ovary “ripens” into a fruit
The ovule develops into a seed
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Other Reproductive Structures Petals: colorful
structures that attract pollinators.
Sepals: surround and protect the flower bud.
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Reflect[Write your answer on the worksheet.]
In which part of a flower are male gametes made?
In which part of a flower are female gametes made?
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PollinationWind, insects or other
animals transfer pollen from the anther (male structures) of one flower to the stigma (female structures) of another
Flowers vary depending on pollination mechanism
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Pollination VectorsWind Pollination: Dull, scentless flowers with reduced petalsBees/Butterfly Pollination: Brightcolor, nectars, scent. They sip nectar, get pollen on coats, transfer pollen from flower to flower
Bird Pollination: Nectars brightcolors, tube-like flowers
Moth Pollination: White petals, open at night
Fly Pollination:Rank odor, fleshcolored petals
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Reflect[Write your answer on the worksheet.]
After pollination, how does the male gamete reach the ovule?
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Seed Dispersal Mechanisms-Allow plants to colonize new areas and avoid
shade of parent plant
Wind Dispersal - Flight mechanisms, like parachutes, wings, etc. Ex. Dandelion, maples, birch
Animal Dispersal - Fleshy fruits which animals eat, drop undigested seeds in feces or burrs which stick to animals’ coats
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Gravity Dispersal - Heavy nuts fall to ground and rollex. acorns
Water Dispersal - Plantsnear water create floating fruitsex. coconuts
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Cambridge Practice Questions
Complete the Cambridge Practice Questions at the end of the handout.