Bio Warm-Up May 2

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Author:
sydluvslife10
ID:
151847
Filename:
Bio Warm-Up May 2
Updated:
2012-05-03 00:11:34
Tags:
May
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Description:
One foot, 2 foot, Red fish, Do it
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  1. What is the tissue difference between seeds of gymnosperms and seeds of angiosperms?
    Angiosperms develop a highly nutritious tissue, called endosperm
  2. What is endosperm?
    A highly nutritious tissue
  3. When does endosperm originate?
    At the same time that an egg is fertilized
  4. In what angiosperms is the endosperm still present in mature seeds?
    Corn and wheat
  5. In what angiosperms is the endosperm completely transferred inot the embryo by the time a seed is mature?
    Beans and peas
  6. Where are the food reserves stored in some angiosperms?
    Cotyledons
  7. What are cotyledons?
    "seed leaves" similar to the endosperm, provides nutrients for embryo
  8. What are the two classes of angiosperms based on thier number of cotyledons?
    • Seeds with two cotyledons called dicotyleons (dicots)
    • Seeds with a single cotyledon called monocotyledons (monocots)
  9. What evolved first out of monocots and dicots?
    Dicots
  10. What are the three characteristics of dicots?
    • Two cotyledons
    • Flower parts in multiples of four and five
    • Veins usually netlike
  11. What are the three characterisitcs of monocots?
    • One cotyledon
    • Flower parts in mulitples of three
    • Veins usually parallel
  12. How many sperm are in each pollen grain?
    2
  13. What happens to sperm in most gymnosperms?
    One of them dies
  14. What happens with sperm in angiosperms?
    Both sperm fuse with certain cells of the megagametophyte
  15. What two cells do sperm of angiosperms fuse with?
    • An egg to form the zygote
    • Two haploid cells forming a triploid cell that turns into endosperm
  16. What is double feritlization?
    The process by which two sperm fuse with cells of the megagametophyte to produce both a zygote and endosperm
  17. Among angiosperms, how did fruits evolve?
    More efficient dispersal of seeds
  18. What does a fruit consist?
    A mature ovary that contains one or more seeds and often includes other flower parts
  19. What are two characterisitcs of mature seeds?
    Often resistant to chewing and digestion
  20. Why are mature seeds not digestible and resistant to chewing?
    So they can pass through an animal and be spread out from the parent plant
  21. What are three ways seeds are speciealized to getting transported?
    • Sticking to animal's fur
    • Floating on wind currents
    • Floating on water

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