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Angiosperms

Angiosperms. Group 3: Seed producing, Vascular Plants. Type 2: Angiosperms (flowering plants) Flower = reproductive structure Purpose: Attract animals Forms fruit to protect and spread seeds Seeds Grow inside the fruit Inside the seed 1. Embryo 2. Food supply. Seed Dispersal.

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Angiosperms

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  1. Angiosperms

  2. Group 3: Seed producing, Vascular Plants Type 2: Angiosperms (flowering plants) Flower = reproductive structure Purpose: Attract animals Forms fruit to protect and spread seeds Seeds Grow inside the fruit Inside the seed 1. Embryo 2. Food supply

  3. Seed Dispersal • Fruit brightly colored • Attracts animals • Seeds pass through animals digestive system • Seeds pooped in a new area to grow Fruit seeds in fox poop

  4. Angiosperm Groups • 2 groups: Based on seed type • Cotyledon: embryonic leaf • Two Categories: • Monocots: embryo with 1 seed leaf • Dicots: embryo with 2 seed leaves

  5. Monocots vs. Dicots Key point Key point

  6. Apple Tree: Monocot or Dicot? 2 3 1 Net-like veins 4 5

  7. Monocot or Dicot? 2 3 1 4 6 5

  8. Monocot or Dicot? 3 petals Parallel veins

  9. Monocot or Dicot? 5 petals

  10. Monocot or Dicot? Veins run parallel

  11. Monocot or Dicot? Veins run parallel

  12. Monocot or Dicot? Veins branch like net

  13. Angiosperm Life Spans Seed germinates Flower  Fruit  Seeds Jan Feb Mar Apr May June July Aug Sept Oct Nov Dec Plant growth Plant dies • Three Life Span Types: 1. Annuals • 1 year: Seed grows…produce flowers & seeds…die

  14. Angiosperm Life Spans Seed germinates Plant growth Dormant Jan Feb Mar Apr May June July Aug Sept Oct Nov Dec Flower  Fruit  Seeds Dormant Plant growth Jan Feb Mar Apr May June July Aug Sept Oct Nov Dec Plant dies • Three Life Span Types: 2. Biennials • 1st year: Seed grows and stores food • 2nd year: grows more, makes flowers & seeds…dies

  15. Angiosperm Life Spans Seed germinates Plant growth Dormant Jan Feb Mar Apr May June July Aug Sept Oct Nov Dec Plant growth Dormant Dormant Jan Feb Mar Apr May June July Aug Sept Oct Nov Dec Flower, Fruit, Seeds Plant growth Dormant Dormant Jan Feb Mar Apr May June July Aug Sept Oct Nov Dec Flower, Fruit, Seeds Plant growth Dormant Dormant Jan Feb Mar Apr May June July Aug Sept Oct Nov Dec Flower, Fruit, Seeds Plant growth Dormant Jan Feb Mar Apr May June July Aug Sept Oct Nov Dec Plant dies • Three Life Span Types: 3. Perennials • Live for more than 2 years

  16. Flowers female male petals sepals • Reproductive structure of angiosperms • Sepals • outer ring of leaves • protection • Petals • Inner ring of leaves • Brightly colored to attract pollinators • Male and female organs found inside

  17. Flowers • Female Carpel • Inner most part • Ovary: within the base (female gametophyte) • Style: long stalk • Stigma: sticky tip, collects pollen • Male Stamen • Surround carpel • Filaments: long stalks • Anther: produces pollen (male gametophyte) style filament

  18. Tulip Pistil and Stamen female male

  19. Lily Pistil and Stamen female male

  20. Pistil and Stamen female male

  21. Pistil and Stamen female male

  22. Self-Pollination(own pollen fertilizes own egg) . . .

  23. Cross-Pollination(pollen of one, fertilizes egg of another) . . .

  24. Meiosis creates 4 haploid microspores (gametophyte) • In each microspore, the nucleus splits in two • 1 nucleus: forms pollen tube • 1 nucleus: splits again to make 2 more nuclei • 1 nucleus: fertilizes the egg • 1 nucleus: fuses to make endosperm In the male anthers:

  25. Pollen grains released

  26. Meiosis makes 4 megaspores (only 1 survives) • In megaspore, mitosis creates 8 nuclei • 1 = egg cell • 2 = forms embryo sac • 5 = disintegrate In the ovule: carpel ovary ovule

  27. Pollination: Pollen land on the stigma . . .

  28. . . . • 3 nuclei in Pollen: • 1: forms pollen tube • 2: transfer into the ovule • Double Fertilization: • 1 sperm nucleus fuses with egg nucleus (zygote created) • 1 sperm nucleus fuses with 2 egg nuclei forming the embryo sac & endosperm Reminder: 3 nuclei in ovule already: 1: forms egg 2: embryo sac

  29. Ovule hardens into seed

  30. Ovary grows into a fruit with the seeds inside… rest of flower dies

  31. Fruit falls to ground

  32. Fruit falls to ground

  33. Fruit is digested…Seeds pass through…

  34. Seedling begins to grow… seed

  35. Years later….

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