bio notes 2-20

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Anonymous
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136972
Filename:
bio notes 2-20
Updated:
2012-02-22 13:34:07
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bio notes
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bio notes
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  1. what are seed plants that form flowers?
    angiosperms
  2. what are seeds that are covered by an ovary or fruit tissue?
    angiosperm
  3. what is the dominant plant group today with about 250,000 species?
    angiosperms
  4. what are some features that contribute to the angiosperms success?
    complex vascular tissues (xylem and phloem), xylem is composed of tracheids and vessel elements, transport water and nutrients more efficiently, phloem has sieve tubes and companion cells, double fertilization, flowers
  5. where do nutrients from sieve tubes come from?
    companion cells
  6. what are some characteristics of double fertilization?
    unique to angiosperms, each pollen grain contains 2 sperm nuclei, has enclosed ovules and seeds
  7. what is the 2 celled male gametophyte involved in double fertilization?
    pollen grain
  8. What is the 7 celled female gametophyte involved in double fertilization?
    embryo sac
  9. how many sperm nuclei does each pollen grain have?
    2
  10. what do the 2 sperm nuclei do in double fertilization?
    1 fertilizes the egg and forms zygote (2n), the other merges with 2 polar nuclei to form endosperm (3n, nutritive tissue),
  11. what happens in fertilization with endosperms?
    1 sperm fertilizes the egg, the other degenerates
  12. what are the ovules and seeds contained in rather than being exposed on scales?
    carpels (modified leaves)
  13. what makes up the ovule?
    integument and embryo sac
  14. what does the carpel/pistil have?
    ovules
  15. what is the structure at the top of the carpel?
    stigma
  16. what do the ovules develop into?
    seeds
  17. what are the 4 major parts of flowers that derive from modified leaves?
    carpel/pistel, stamen, petals, sepal
  18. what is the bear megasporangia in flowers?
    carpel/pistil
  19. what is the bear microsporangia in flowers?
    stamen
  20. what 2 things are in the stamen?
    anthers, filaments
  21. what surrounds the stamen and are usually brightly colored?
    petals
  22. what structure sometimes looks like petals?
    sepal
  23. what do flowers produce to attract (bribe) animals?
    nectar and pollen
  24. how do animals help flowers?
    transfer pollen from one plant to another

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