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Flower Flower The organ responsible for sexual reproduction in plants The organ responsible for sexual reproduction in plants Function- Function- produce.

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Presentation on theme: "Flower Flower The organ responsible for sexual reproduction in plants The organ responsible for sexual reproduction in plants Function- Function- produce."— Presentation transcript:

1 Flower Flower The organ responsible for sexual reproduction in plants The organ responsible for sexual reproduction in plants Function- Function- produce gametes produce gametes pollination pollination fertilization fertilization develop seeds develop seeds develop fruit develop fruit

2 4 Basic Whorls of a Flower Calyx- Outermost Whorl Calyx- Outermost Whorl All of the sepals collectively All of the sepals collectively Corolla- 2 nd Outermost Whorl Corolla- 2 nd Outermost Whorl All of the petals collectively All of the petals collectively

3 4 Basic Whorls of a Flower Stamen- 3 rd Outermost Whorl Stamen- 3 rd Outermost Whorl Male structure of the flower Male structure of the flower Pistil- Made of fused carpels- Innermost Whorl Pistil- Made of fused carpels- Innermost Whorl Female structure of flower Female structure of flower

4 Diagram 1- Flower Structure 1. Petals- 1. Petals- Colorful leaf-like parts, attract animals/insects, aids in pollination Colorful leaf-like parts, attract animals/insects, aids in pollination 2. Stamen- 2. Stamen- Male structure Male structure

5 Diagram 1- Flower Structure 3. Pistil- 3. Pistil- Female structure Female structure 4. Pedicel/- 4. Pedicel/Receptacle- Stalk like part, supports the flower Stalk like part, supports the flower

6 Diagram 1- Flower Structure 5. Sepals- 5. Sepals- Small leaves that surround and protect the flower bud Small leaves that surround and protect the flower bud 6. Stigma- 6. Stigma- Sticky top to the pistil, collects the pollen during pollination Sticky top to the pistil, collects the pollen during pollination

7 Diagram 1- Flower Structure 7. Style- 7. Style- Long stalk like part that extends from ovary, supports the stigma Long stalk like part that extends from ovary, supports the stigma 8. Ovule- 8. Ovule- Located inside the ovaries, will develop into a seed after fertilization Located inside the ovaries, will develop into a seed after fertilization

8 Diagram 1- Flower Structure 9. Ovary- 9. Ovary- Enlarged base of the pistil, will develop into fruit after fertilization Enlarged base of the pistil, will develop into fruit after fertilization 10. Filament- 10. Filament- Slender stalk that supports the anther of the stamen Slender stalk that supports the anther of the stamen

9 Diagram 1- Flower Structure 11. Pollen- 11. Pollen- Formed in the anther, contains 2 nuclei, 1 tube nucleus, 1 generative nucleus Formed in the anther, contains 2 nuclei, 1 tube nucleus, 1 generative nucleus 12. Anther- 12. Anther- Knob like end of the stamen, forms the sperm nuclei and the pollen grains Knob like end of the stamen, forms the sperm nuclei and the pollen grains

10 Diagram 2- Pollination (p 617) The transfer of pollen from the anther to the stigma of flowers Usually aided by insects or wind

11 Diagram 2- 2 types Self pollination Self pollination Same plant Same plant Either the same flower or 2 flowers on the same plant Either the same flower or 2 flowers on the same plant Or 2 genetically identical plants Or 2 genetically identical plants Cross pollination Cross pollination Two genetically different plants Two genetically different plants

12 Diagram 2- Pollination  Fertilization (p 617) 2 separate events 2 separate events Pollination occurs on the stigma Pollination occurs on the stigma Fertilization occurs in the ovule Fertilization occurs in the ovule

13 Diagram 2- After Pollination (p 617) Pollen grain releases tube & generative nucleus into pistil Pollen grain releases tube & generative nucleus into pistil #14. Tube nucleus develops pollen tube #14. Tube nucleus develops pollen tube #13. Two sperm nuclei- from mitosis of the generative nucleus #13. Two sperm nuclei- from mitosis of the generative nucleus #15. Pollen tube develops through style to ovule #15. Pollen tube develops through style to ovule 2 sperm nuclei travel through tube to ovule 2 sperm nuclei travel through tube to ovule

14 Diagram 2- Fertilization (p 617) Double fertilization in the ovule Double fertilization in the ovule One sperm nucleus fertilizes (#16) egg nucleus to form the zygote (fertilized egg), this becomes the embryonic plant of the seed One sperm nucleus fertilizes (#16) egg nucleus to form the zygote (fertilized egg), this becomes the embryonic plant of the seed

15 Diagram 2- Fertilization (p 617) Second sperm nucleus unites with (#17) 2 polar bodies, forms triploid (3n) cell that develops into endosperm of the seed Second sperm nucleus unites with (#17) 2 polar bodies, forms triploid (3n) cell that develops into endosperm of the seed

16 Diagram 3- Gamete Formation- Male (p 615) Occurs in anther Occurs in anther Sketch Sketch Diploid  Diploid  Meiosis  Meiosis  4 haploid cells  4 haploid cells  Mitosis  Mitosis  Pollen grain with 2 nuclei Pollen grain with 2 nuclei

17 Diagram 3- Gamete Formation- Female (p 615) Occurs in ovule Occurs in ovule Sketch Sketch Diploid  Diploid  meiosis  meiosis  4 haploid cells(3 die)  4 haploid cells(3 die)  mitosis  mitosis  8 haploid cells (5 die)  8 haploid cells (5 die)  3 haploid cells 3 haploid cells

18 Seed (p 620) An embryonic plant with a food source An embryonic plant with a food source Grows into a new plant Grows into a new plant Germination Germination Water, temp., oxygen Water, temp., oxygen Plumule (shoot tip w/embryonic leaves) Plumule (shoot tip w/embryonic leaves) Epicotyl (stem) Epicotyl (stem) Hypocotyl Hypocotyl Radicle (root) Radicle (root) Cotyledon (food source) Cotyledon (food source) Endosperm (food source) Endosperm (food source)

19 Fruit (pp 618, 619) Surrounds seeds Surrounds seeds Dispersal of seeds- spread seeds around Dispersal of seeds- spread seeds around Wind Wind Water Water Animals Animals Edible Edible Carrier Carrier


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