Biology Lesson 3.2

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Biology Lesson 3.2

  1. 1. Lesson 3.2Seeds develop from thefertilized ovule.Fruits develop from theripening ovary.
  2. 2. Lesson 3.2Fruit provides protection anddispersal for seeds.Fruits include acorns, grainsof wheat, tomatoes, and whatwe think of as fruits (oranges,apples, etc.)
  3. 3. ANY RIPENED OVARY IS A FRUIT!!!
  4. 4. POLLINATION-IS THE TRANSFER OFPOLLEN FROM THE ANTHERTO THE STIGMA OF THEPISTIL.
  5. 5. POLLINATIONTwo types of pollination:1.Self pollination•pollination that occurs within thesame flower or anotherflower on thesame plant.
  6. 6. POLLINATIONTwo types of pollination:2. Cross pollination•when pollen comes from theanther of one plant to the stigmaof a different plant.•Aided by birds, insects, wind,rain and horticulturalist.
  7. 7. Factors affecting pollination:1.nectar – sweet substance toattract insects and birds (bees andhumming birds)
  8. 8. Factors affecting pollination: 1. Nectar2. colorful flowers and fragrancesex. Carrion plant produces a flowerthat smells like raw meat and is redlike raw meat. It attracts flies to helpwith pollination.
  9. 9. Carrion plant
  10. 10. Factors affecting pollination: 1. Nectar 2.Colorful flowers and fragrances 3.Creator DesignOr How a flower and insect aredesigned by the Creator. Ex. Yucca flower is only pollinated by the Yucca moth that can reach the pollen.
  11. 11. Horticulturalist•specialize in growing plants•artificially cross pollinate differentspecies to produce HYBRIDS.•Hybrids – a combinationex. Seedless watermelons
  12. 12. Fertilization – the joining of thesperm cell (male gamete) withthe egg cell (female gamete). Gamete = reproductive cell
  13. 13. Pollen has traveled and landed on stigma. (pollination)Steps of fertilization:1. Pollen tube is formed and growsdown to the ovule.2. Sperm cell divides forming twosperm cells.
  14. 14. 1. 2.
  15. 15. Steps of fertilization:3. Sperm cells travel down thepollen tube to the ovule.4. One sperm cell unites withegg cell in the ovule.5. The other sperm celltriggers the production ofendosperm.
  16. 16. 4.
  17. 17. Sexual Reproduction: requires theunion of the male and femalegametes resulting in the exchangeof genetic information.
  18. 18. Asexual reproduction:•Formation of new individualsfrom a single parent cell•No genetic information isexchanged•No fertilization
  19. 19. Formation of Ripening FruitWhen ovule is fertilized aseed is produced.Seed triggers the release ofhormone in the plant thattells the fruit to ripen.
  20. 20. Formation of Ripening FruitSome plants have fruitswithout seeds such as thebanana.Banana treereproduces asexually from rhizome (under ground stem)
  21. 21. Formation of Ripening FruitFruits are prepared forpicking by the formation ofthe abscission layer wherethe fruit attaches to thebranch.
  22. 22. Pollen and PeoplePollen breathed intorespiratory system by people can cause an allergic reactioncalled HAYFEVER.
  23. 23. Pollen and PeoplePollen triggers the body to releasea chemical messenger calledhistamine which causes anallergic reaction in the body.People taken an antihistamine toblock the production of thehistamine.
  24. 24. Pollen and PeopleThe pollen index isbased on amount ofragweedpollen in theair.

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