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Flower The organ responsible for sexual reproduction in plants

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

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 Cross 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  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

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