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Flower Reproduction
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Flower Reproduction

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  • 1. Pollination & Fertilization
  • 2. Angiosperms
    • most successful type of plant on Earth
    the most widespread and diverse of all plants
  • 3. Flowers increase reproductive success. color, shape, scent attract pollinators that increase likelihood pollen will be united with another flower
  • 4.  
  • 5. Some flowers are small and inconspicuous and therefore dependent on the wind for pollination. For example . . .
  • 6. . . . grasses
  • 7.  
  • 8.  
  • 9.  
  • 10.  
  • 11. Pollen Grains
    • Capsules with specialized cells:
    • two sperms cells
    • one “tube” cell
    all three of these cells are haploid half the number of chromosomes for that species
  • 12. Pollination: when pollen lands on a stigma tube cell grows a tube down through the style and into the ovary
  • 13. sperm move through the tube and into the ovary
  • 14. one sperm fertilizes an egg to form a diploid zygote that grows into an embryo plant
  • 15. the other sperm fertilizes a special cell that develops endosperm
  • 16. endosperm is food storage tissue that supports the embryo plant inside the seed
  • 17. From pollination to fertilization can take an hour or days as the amount of time it takes for a sperm to travel through the pollen tube can vary.
  • 18.  

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