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CSU - BC 103 - Life 103- week 4 - Class Notes

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CSU - BC 103 - Life 103- week 4 - Class Notes

School: Colorado State University
Department: Biology
Course: Biology of Organisms-Animals and Plants
Professor: Jennifer Dewey
Term: Fall 2016
Tags: Biology
Name: Life 103- week 4
Description: One week notes, lacking Wednesday because of exam
Uploaded: 02/12/2016
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background image Seed Plants    All seed plants have reduced gametophytes, pollen, ovules, and therefore are  heterosporous  (make male and female gametes). 
 
Gymnosperms: 
“naked” seeds  Seed=sporophyte embryo + nutrients + protective coat (desiccation resistance) 
*Seeds allow dispersal over greater distances then remain dormant until the environment is 
proper to begin growth, at which point the seed provides energy for the embryo. 
 
The female parts of a gymnosperm are the 
megasporangium ­the diploid tissue that produces  megaspores through meiosis­ and the  megaspore ­the haploid cell that will become the female  gametophyte­ wrapped in an  integument  which protects.  The male parts are the  microsporangium ­the diploid tissue that produces microspores through  meiosis­ and the  microspore ­the haploid cell that will become the male gametophyte of  pollen  grains  
Pollination is when pollen is transferred to the ovule containing structures. Once the pollen grain 
germinates, a pollen tube digests its way to the egg and their nuclei fuse to form an embryo. 
 
Four Gymnosperm Phyla: 
● Coniferophyta­ the majority of gymnosperms, involves large female cones of modified  leaves and smaller male cones which release pollen  (Conifer=cone bearing)  ● Cycadophyta (130 species) 
● Gnetophya (76 species) 
● Gingkophyta (1 living species) 
 
Angiosperms:  
All have flowers and fruits, specialized for sexual reproduction. 
Most diverse and most adapted to life on land 
All in phylum Anthophyta 
 
Flowers  are shoots (vs roots), typically pollinated by insects or animals (therefore pollination is  more directed compared to wind pollination), with four types of modified leaves­  ● Sepals­ green flaps to enclose the flower before blooming 
● Petals­ brightly colored in order to attract pollinators 
● Stamens­ to produce male gametes (pollen)­ made up of filament and anther 
○ anther contains the microsporangia which produces the microspores/pollen 

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School: Colorado State University
Department: Biology
Course: Biology of Organisms-Animals and Plants
Professor: Jennifer Dewey
Term: Fall 2016
Tags: Biology
Name: Life 103- week 4
Description: One week notes, lacking Wednesday because of exam
Uploaded: 02/12/2016
2 Pages 14 Views 11 Unlocks
  • Better Grades Guarantee
  • 24/7 Homework help
  • Notes, Study Guides, Flashcards + More!
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