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Plant Reproduction Angiosperms (flowering plants) Plants that protect their seeds within the body of a fruit. Make up ¾s of all plants, including: –Trees,

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Presentation on theme: "Plant Reproduction Angiosperms (flowering plants) Plants that protect their seeds within the body of a fruit. Make up ¾s of all plants, including: –Trees,"— Presentation transcript:

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2 Plant Reproduction

3 Angiosperms (flowering plants) Plants that protect their seeds within the body of a fruit. Make up ¾s of all plants, including: –Trees, shrubs, herbs, grasses, water plants…

4 Structure of a Flower 1. Pistil 2. Stigma 3. Style 4. Ovary 5. Stamen 6. Filament 7. Anther 8. Petal 9. Sepal 10. Receptacle 11. Stem

5 Male Reproductive Structure The 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

6 Female Reproductive Structure The pistil consists of the stigma, style and ovary The sticky stigma receives the pollen from the anther The pollen grows a tube down through the style Meiosis occurs in the ovary to produce haploid ovules

7 Reproductive Structures Petals: colourful structures that attract pollinators. Sepals: surround and protect the flower bud.

8 Pollination Wind, insects or other animals transfer pollen from the anther of one flower to the stigma of another Flowers vary depending on pollination mechanism

9 Pollination Animation

10 Pollination Vectors Wind Pollination: Dull, scentless flowers with reduced petals Bees/Butterfly Pollination: Bright color, nectaries, scent. They sip nectar, get pollen on coats, transfer pollen from flower to flower Bird Pollination: Nectaries, bright colors, tube-like flowers Moth Pollination: White petals, open at night Fly Pollination:Rank odor, flesh colored petals

11 Pollen GrainAnther Sac Pollen grains contain two haploid cells produced through meiosis. 1- The Tube cell – will grow the pollen tube. 2- The Generative cell – will go through mitosis to create two sperm cells.

12 Ovary Each ovule within an ovary has a micropyle (an opening for the pollen tube). The ovules megasporangium undergo meiosis to produce four haploid cells (3 die leaving 1 megaspore) The megaspore undergoes mitosis 3 times to produce 8 haploid cells within the embryo sac.

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14 Fertilization {After pollen lands on the stigma, a pollen tube grows down through the style to ovary {Generative cell creates the two sperm nuclei {Double fertilization occurs: {one sperm fertilizes the egg { one sperm the two polar nuclei together

15 Result of Double FertilizationDouble Fertilization {The sperm nucleus and egg nucleus join to form a 2n (diploid) embryo {The other sperm nucleus and the two polar nuclei join to form a 3n (triploid) endosperm. The endosperm is the food supply for the embryo. {First linkFirst link

16 Seed and Fruit Development {After fertilization, the petals and sepals fall off flower {Ovary ripens into a fruit {The ovule develops into a seed

17 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

18 Gravity Dispersal - Heavy nuts fall to ground and roll ex. acorns Water Dispersal - Plants near water create floating fruits ex. coconuts


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