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Plant Reproduction

Plant Reproduction. Sexual Reproduction of Angiosperms. Adaptations of flowers to insure successful reproduction: Bright Colors Scent Shape and Sizes. WHY?!?. Attract animal pollinators. Angiosperms…. Flowers that are not bright in color, smell good, or good in shape and size rely on:

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Plant Reproduction

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  1. Plant Reproduction

  2. Sexual Reproduction of Angiosperms • Adaptations of flowers to insure successful reproduction: • Bright Colors • Scent • Shape and Sizes

  3. WHY?!? • Attract animal pollinators

  4. Angiosperms… • Flowers that are not bright in color, smell good, or good in shape and size rely on: • Wind • Water • Indirect Pollination • Self Pollination

  5. Parts of a Flower 1. Sepals 2. Petals 3. Stamen 4. Carpels

  6. Parts of a flower Petal (Carpels)

  7. Parts of a Flower • Sepal-outer most ring protect the petals when the flower is developing

  8. Parts of a Flower • Petals- 2nd ring in, job is to attract pollinators, size and shape, and fragrance.

  9. Parts of a Flower-Stamen • Stamen-3rd ring in, is the male reproductive structure.

  10. Parts of a Flower-Stamen • Anther: pollen structures that develop into pollen grains. • Filament: supports the anther, stalk-like

  11. Parts of a Flower-Carpels • Carpels- inner most ring, female reproductive structure. (Carpels)

  12. Parts of a Flower-Carpels -Pistil- 2 or more carpels fused together • A. Stigma- top part of the pistil tip of style, contains hairs to attract pollen grains • B. Style-Stalk-like, raises up from ovary where pollen tubes are created • C. Ovary-large base of pistil, ovules are found inside (female sex cells)

  13. Parts of a Flower-Carpels

  14. Flower Facts • Most flowers=hermaphrodites • Some=only 1 sex organ • Annual= plant every year • Perennials= come back each year

  15. Plant Reproduction**See Figure 32-9 Pg. 633** • Ovules- form in ovary of pistil • Pollen Grains- form in anther of stamen

  16. Pollen Grains

  17. Pollination • Transfer of pollen from the anther to the egg in the ovary thru many methods

  18. Double Fertilization • Union of gametes • 1n pollen + 1n ovule= 2n zygote • Zygote goes through mitosis to create the embryo Step 1: Sperm #1

  19. Double Fertilization Step 2: Sperm #2 1n pollen + 2 polar nuclei = 3n endosperm endosperm • for nourishment for embryo • used up by embryo as seeds mature

  20. Fruit • Mature ovary • Made up of maternal tissue • Purpose • Protect seeds and aid in dispersal • If too close together compete to survive • Delays sprouting until correct conditions are available

  21. Types of Fruit • 1. Simple • Single ovary from a single flower formed from 1 pistil of 1 flower • Ex. Dry vs. Fleshy • Peas, corn, wheat, cherry, apple, tomato

  22. Types of Fruit • 2. Aggregate • Formed from several pistils of a single flower • Ex. Raspberry and Strawberry

  23. Types of Fruit • 3. Multiple • Formed from several flowers growing together • Ex. Pineapples and Figs

  24. Parts of a Fruit (Pit) (Flesh) (Skin)

  25. Fruit and Seed Dispersal • Wind • Orchids= dust like seeds • Dandelions= parachutes

  26. Fruit and Seed Dispersal • Animal • Seeds pass unharmed thru digestive tract (Feces + New Spot) • Carry seeds or fruit on or in them

  27. Fruit and Seed Dispersal • Water • Seeds or fruits contain air chambers that allow them to float • Ex. Coconut

  28. Fruit and Seed Dispersal • Gravity • Male cones on top facing down, female facing up • Sperm falls from seeds, cone fall off and roll away

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