bio cards 2/13

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134953
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bio cards 2/13
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2012-02-13 12:55:45
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bio cards 2/13
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  1. what are the 3 clades of nonvascular land plants?
    liverworts, mosses, hornwarts
  2. what do liverworts have that the other 2 clades do not?
    stomata
  3. what is stomata used for?
    gas exchange and to conserve water
  4. what do liverworts and mosses not have?
    persistently green sporophyte
  5. what clade has persistently green sporophytes similar to higher plants?
    horn warts
  6. are most nonvascular plants economically important?
    no
  7. what is the exception to vascular plants being economically unimportant?
    sphagnum moss
  8. what is the purpose of spagnum moss?
    it gets condensed into peat which can be used for fuel (very smoky)
  9. what is another use of spagnum moss?
    it is very absorbent, used for gardening and field dressing for wounds, and diapers
  10. waht percentage of earth do peat bogs cover?
    about 1% (1/2 the size of U,S.)
  11. characteristics of peat bogs?
    cover 1% of Earth, acidic, low oxygen, slow decomposition of organic matter
  12. what are the two types of tissue in vascular plants?
    xylem and phloem
  13. what is the purpose of vascular tissues?
    facilitate transfer of materials
  14. which tissue transports water upward?
    xylem
  15. which tissue transports water up and down?
    phloem
  16. what impregnated xylem cells (trachenids) provide rigid structural support which allow access to sunlight?
    lignin
  17. characteristics of a sporophyte?
    diploid, dominant generation, long lived, independant of gametophyte, produce sporangia which produce spores by meiosis, spores disperse long distances then germenate to gametophye
  18. how do sporophytes produce sporoangia?
    by meiosis
  19. what do spores germenate to form?
    gametophytes
  20. characteristics of a gametophyte?
    haploid, much less noticable, short-lived, independant of sporophytes, produce haploid gametes by mitosis
  21. how do gametophytes produce haploid gametes?
    by mitosis
  22. what does fertilization require?
    water for sperm to swim to the egg
  23. what does the embryo form into (while it is still protected)
    sporophyte
  24. what is a horizontal stem called?
    rhizome
  25. what are the clades of seedless vascular plants?
    club mosses, horsetails, whisk ferns, ferns
  26. what has more vertical and branching growth form?
    seedless vascular plants
  27. what has more photosynthetic area and spores than unbranched forms?
    seedless vascular plants

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