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Flower PowerPoint Presentation

Flower

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Flower

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

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

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

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

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

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

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

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

  9. Diagram 1- Flower Structure • 11. Pollen- • Formed in the anther, contains 2 nuclei, 1 tube nucleus, 1 generative nucleus • 12. Anther- • 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 • Same plant • Either the same flower or 2 flowers on the same plant • Or 2 genetically identical plants • Cross pollination • Two genetically different plants

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

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

  14. Diagram 2- Fertilization (p 617) • 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

  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

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

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

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

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