Pollination & Fertilization
Angiosperms <ul><li>most successful type of plant on Earth </li></ul>the most widespread and diverse of all plants
Flowers increase reproductive success. color, shape, scent attract pollinators that increase likelihood pollen will be uni...
 
Some flowers are small and inconspicuous and therefore dependent on the wind for pollination. For example . . .
. . . grasses
 
 
 
 
Pollen Grains <ul><li>Capsules with specialized cells: </li></ul><ul><li>two sperms cells </li></ul><ul><li>one “tube” cel...
Pollination: when pollen lands on a stigma tube cell grows a tube down through the style and into the ovary
sperm move through the tube and into the ovary
one sperm fertilizes an egg to form a diploid zygote that grows into an embryo plant
the other sperm fertilizes a special cell that develops endosperm
endosperm is food storage tissue that supports the embryo plant inside the seed
From pollination to fertilization can take an hour or days as the amount of time it takes for a sperm to travel through th...
 
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Flower Reproduction

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Flower Reproduction

  1. 1. Pollination & Fertilization
  2. 2. Angiosperms <ul><li>most successful type of plant on Earth </li></ul>the most widespread and diverse of all plants
  3. 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 . . .
  5. 6. . . . grasses
  6. 11. Pollen Grains <ul><li>Capsules with specialized cells: </li></ul><ul><li>two sperms cells </li></ul><ul><li>one “tube” cell </li></ul>all three of these cells are haploid half the number of chromosomes for that species
  7. 12. Pollination: when pollen lands on a stigma tube cell grows a tube down through the style and into the ovary
  8. 13. sperm move through the tube and into the ovary
  9. 14. one sperm fertilizes an egg to form a diploid zygote that grows into an embryo plant
  10. 15. the other sperm fertilizes a special cell that develops endosperm
  11. 16. endosperm is food storage tissue that supports the embryo plant inside the seed
  12. 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.

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