Flower Flower The organ responsible for sexual reproduction in plants The organ responsible for...
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FlowerFlower
The organ responsible The organ responsible for sexual for sexual reproduction in plantsreproduction in plants
Function- Function- produce gametesproduce gametes pollinationpollination fertilizationfertilization develop seedsdevelop seeds develop fruitdevelop fruit
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4 Basic Whorls of a Flower4 Basic Whorls of a Flower
CalyxCalyx- Outermost - Outermost WhorlWhorl
All of the sepals All of the sepals collectivelycollectively
CorollaCorolla- 2- 2ndnd Outermost WhorlOutermost Whorl
All of the petals All of the petals collectively collectively
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4 Basic Whorls of a Flower4 Basic Whorls of a Flower
StamenStamen- 3- 3rdrd Outermost Outermost WhorlWhorl Male structure of the Male structure of the
flowerflower PistilPistil- Made of fused - Made of fused
carpels- Innermost carpels- Innermost WhorlWhorl Female structure of Female structure of
flowerflower
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Diagram 1- Flower StructureDiagram 1- Flower Structure
1. 1. PetalsPetals- - Colorful leaf-like parts, Colorful leaf-like parts,
attract animals/insects, attract animals/insects, aids in pollinationaids in pollination
2. 2. StamenStamen- - Male structureMale structure
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Diagram 1- Flower StructureDiagram 1- Flower Structure
3. 3. PistilPistil- - Female structureFemale structure
44. . Pedicel/Pedicel/Receptacle-- Stalk like part, supports Stalk like part, supports
the flowerthe flower
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Diagram 1- Flower StructureDiagram 1- Flower Structure
5. 5. SepalsSepals- - Small leaves that Small leaves that
surround and protect the surround and protect the flower bud flower bud
6. 6. StigmaStigma-- Sticky top to the pistil, Sticky top to the pistil,
collects the pollen during collects the pollen during pollinationpollination
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Diagram 1- Flower StructureDiagram 1- Flower Structure
7. 7. StyleStyle- - Long stalk like part that Long stalk like part that
extends from ovary, extends from ovary, supports the stigmasupports the stigma
8. 8. OvuleOvule- - Located inside the Located inside the
ovaries, will develop into ovaries, will develop into a seed after fertilizationa seed after fertilization
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Diagram 1- Flower StructureDiagram 1- Flower Structure
9.9. Ovary Ovary- - Enlarged base of the Enlarged base of the
pistil, will develop into pistil, will develop into fruit after fertilizationfruit after fertilization
10. 10. FilamentFilament- - Slender stalk that Slender stalk that
supports the anther of the supports the anther of the stamenstamen
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Diagram 1- Flower StructureDiagram 1- Flower Structure
11. 11. PollenPollen- - Formed in the anther, Formed in the anther,
contains 2 nuclei, contains 2 nuclei, 1 tube 1 tube nucleusnucleus, , 1 generative 1 generative nucleusnucleus
12. 12. AntherAnther- - Knob like end of the Knob like end of the
stamen, forms the sperm stamen, forms the sperm nuclei and the pollen nuclei and the pollen grainsgrains
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Diagram 2- Pollination (p 617)Diagram 2- Pollination (p 617)
The transfer of pollen from the anther to the stigma of flowers
Usually aided by insects or wind
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Diagram 2- 2 typesDiagram 2- 2 types
Self pollinationSelf pollination Same plantSame plant Either the same flower Either the same flower
or 2 flowers on the or 2 flowers on the same plantsame plant
Or 2 genetically Or 2 genetically identical plantsidentical plants
Cross pollinationCross pollination Two genetically Two genetically
different plantsdifferent plants
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Diagram 2- Pollination Diagram 2- Pollination Fertilization (p 617)Fertilization (p 617)
2 separate events2 separate events Pollination occurs on the Pollination occurs on the
stigmastigma
Fertilization occurs in Fertilization occurs in the ovulethe ovule
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Diagram 2- After Pollination (p 617)Diagram 2- After Pollination (p 617)
Pollen grain releases tube & generative Pollen grain releases tube & generative nucleus into pistilnucleus into pistil #14. Tube nucleus develops pollen tube#14. Tube nucleus develops pollen tube #13. Two sperm nuclei- from mitosis of the #13. Two sperm nuclei- from mitosis of the
generative nucleusgenerative nucleus #15. Pollen tube develops through style to ovule#15. Pollen tube develops through style to ovule
2 sperm nuclei travel through tube to ovule2 sperm nuclei travel through tube to ovule
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Diagram 2- Fertilization (p 617)Diagram 2- Fertilization (p 617)
Double fertilization in Double fertilization in the ovulethe ovule One sperm nucleus One sperm nucleus
fertilizes (#16) egg fertilizes (#16) egg nucleus to form the nucleus to form the zygote (fertilized egg), zygote (fertilized egg), this becomes the this becomes the embryonic plant of the embryonic plant of the seedseed
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Diagram 2- Fertilization (p 617)Diagram 2- Fertilization (p 617)
Second sperm nucleus Second sperm nucleus unites with (#17) 2 polar unites with (#17) 2 polar bodies, forms triploid bodies, forms triploid (3n) cell that develops (3n) cell that develops into endosperm of the into endosperm of the seedseed
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Diagram 3- Gamete Formation- Diagram 3- Gamete Formation- Male (p 615)Male (p 615)
Occurs in antherOccurs in anther SketchSketch Diploid Diploid Meiosis Meiosis 4 haploid cells 4 haploid cells Mitosis Mitosis Pollen grain with 2 Pollen grain with 2
nucleinuclei
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Diagram 3- Gamete Formation- Diagram 3- Gamete Formation- Female (p 615)Female (p 615)
Occurs in ovuleOccurs in ovule SketchSketch Diploid Diploid meiosis meiosis 4 haploid cells(3 die) 4 haploid cells(3 die) mitosis mitosis mitosis mitosis mitosis mitosis 8 haploid cells (5 die) 8 haploid cells (5 die) 3 haploid cells3 haploid cells
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Seed (p 620)Seed (p 620) An embryonic plant with An embryonic plant with
a food sourcea food source Grows into a new plant Grows into a new plant
Germination Germination Water, temp., oxygenWater, temp., oxygen
Plumule (shoot tip Plumule (shoot tip w/embryonic leaves)w/embryonic leaves)
Epicotyl (stem)Epicotyl (stem) HypocotylHypocotyl Radicle (root)Radicle (root) Cotyledon (food source)Cotyledon (food source) Endosperm (food source)Endosperm (food source)
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Fruit (pp 618, 619) Fruit (pp 618, 619)
Surrounds seedsSurrounds seeds Dispersal of seeds- Dispersal of seeds-
spread seeds aroundspread seeds around WindWind WaterWater AnimalsAnimals
EdibleEdible CarrierCarrier