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Biology Lesson 3.1
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Biology Lesson 3.1


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  • 1. Chapter 3 Lesson 1Flower – the structure of anangiosperm plant that contains themale and female reproductive organs.Function of theflower is toProduce S E E D s!
  • 2. Where do you find a flowers?……at the enlarged end Of the stemcalled the flower stalk orpedicel.
  • 3. Parts of the flower
  • 4. Pistil- female reproductive partof the flowerIncludes:1. Stigma – sticky top surfacewhere the pollen sticks2. Style – long tube thatconnects the stigma and the ovary
  • 5. 3.Ovary – houses the ovules thatcontain the embryo. The ovarydevelops into the fruit that providesnutrients for the developingembryo.4. Ovule – contains the egg celland when fertilized contains thedeveloping embryo. The ovulebecomes the seed.
  • 6. ovules
  • 7. Stamen – male reproductive part ofthe flowerIncludes:1. Anther – where one finds thepollen grains2. Pollen – contain the sperm nuclei3. Filament – the long stalk thatattaches the anther to the receptacle
  • 8. AntherAnther With pollen Filament
  • 9. Other important parts of a flower:1.Receptacle – the base of theflower2. Sepals – small green leaves thathouse the developing bud (flower).Collectively called the calyx.
  • 10. Other important parts:3. Pedicel – the end of the stemwhere the flower is found4. Petals – colorful structuressurround the reproductive parts offlower and attract insects.Collectively called corolla.
  • 11. Complete and Incomplete FlowersComplete flowers A flower that has all of thenormal flower parts, namely, thesepals, petals, stamens, andpistil.
  • 12. Complete and Incomplete FlowersIncomplete flowersAn incomplete flower is missingone of the four major parts of theflower, the stamen, pistil, petals, orsepals. Examples: the oak family, thebirch family, and the walnut family
  • 13. Incomplete Flower – Beech
  • 14. Incomplete FlowersExample: Poinsettia lacks petals – red Isactually leaves calledBracts.
  • 15. Perfect vs. Imperfect FlowersPerfect flowersFlower with both sexeshas both stamens andpistilsMay lack sepals orpetals.
  • 16. Perfect flower
  • 17. Perfect vs. Imperfect FlowersImperfect flowers lack eitherstamens or pistils, and may or maynot have sepals or petals.
  • 18. Types of Imperfect Flowers1. Pistillate FlowerIs a female flowerHave a functional pistil, buteither have no stamen at all, orhave stamens with anthers thatare incapable of producingpollen. example: corn ears
  • 19. Types of Imperfect Flowers2. Staminate Flower Is a male flower Have functional stamenscapable of producing pollen, buteither have no ovary at all, or anovary which is not fertile.Example: corn tassels
  • 20. Types of Imperfect Plants1. Monoecious -Said of a plant species in whichall individuals bear both staminateand pistillate flowers,
  • 21. Types of Imperfect Plants1. Monoecious -For example:Oaks—with maleflowers in catkins,producingwind-borne pollen,
  • 22. Types of Imperfect Plants1. Monoecious -For example:Oaks—with male flowers in catkins, producing wind-borne pollen,and female flowerson the stems,producingacorns.
  • 23. Types of Imperfect Plants1. Monoecious -Ex. Also corn – tassel = male and ear = female but on same plant
  • 24. Types of Imperfect Plants2. Dioecious -said of a plant specieswhich has some individualswhich bear only staminateflowers,and some which bear onlypistillate flowers,
  • 25. Types of Imperfect Plants2. Dioecious -and there are no perfect flowers.These are the species that arecommonly referred to as havingmale and female plants.
  • 26. Flower ArrangementSome have a single flower on eachstalk like a rose.
  • 27. Flower ArrangementMost are inflorescence whichhave clusters of flowers.
  • 28. 1. Soil fertility2. Hormones3. Leaves4. Flowers5. Day6. Long7. Day8. Morning Glory