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CSU - BC 103 - Life 103- week 5 - Class Notes

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CSU - BC 103 - Life 103- week 5 - Class Notes

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background image Finishing up Angiosperms… 
­cotyledon­ initial ‘leaves’ for energy purposes; thicker than normal leaves, not specialized for 
○ more than 70,000 species  ● One cotyledon 
● parallel veins on leaves, flowers, etc 
● vascular tissue placed randomly through the stem 
● fibrous roots (no main root) 
● pollen grain has only 1 opening 
● petals and other floral organs in multiples of 3 (3,6,9, etc) 
Includes: orchids, palms, grasses (grasses too have flowers, just tiny and slightly hidden)   
~Eudicots (“Eu”=true, “di”=two, “cots”=cotyledons)
­includes most dicots  ○ more than 170,000 species  ● Two cotyledons 
● branching veins through leaves, flowers, etc 
● organized vascular tissue; makes a ring if you look at a cross section of a stem 
● taproot/ main root 
● pollen grain has 3 openings 
● petals and other floral organs in multiples of 4 or 5 
Includes: legumes, roses, most flowering trees   
~Basal Angiosperms 
○ 100 species  Amborella  Water Lillies  Star Anise   
○ 8,000 species  Magnolias  Laurels   
*Seed plants are crucial for humans by providing a great part of our food, fuel, wood, and 
background image Always remember the 5 key traits derived by seed plants:  smaller gametophytes as reduced part of life cycle  heterosporous­ have two types of spores, which develop into either male OR female;  ovules (the female gametophyte)  pollen (the male gametophyte)  seeds­ formed after fertilization   
Plant Structure  Summary­  Two main systems: Shoot system, made up of leaves and stem, and Root system, made up of 
All leaves, stems, and roots are made up of dermal, vascular, and ground tissue. 
All tissues are made up of parenchyma, collenchyma, and sclerenchyma cells. 
~ Roots Purposes­ hold plant firmly in ground     ­absorb water and minerals from underground 
   ­storage for carbohydrates/sugars 
Parts­ taproot (mainly eudicots have this system)­ main root which extends deeply vertically; can  tap into deep water sources           ­lateral roots­ extend off of tap root like branches­ improve security in the ground, site of most water absorption           ­root hairs­ grow off of lateral roots, fine/thin for maximum surface area 
Types of root systems­  
­Taproot­ allows plant to grow tall­ easier to pull up but stronger to support  altitude of the plant  ­ Fibrous­ adventitious roots form network directly off of stem once the radicle  dies  *holds plant in to survive grazing animals, but plant does not grow tall  Evolutionary adaptations­   ­prop roots­ splay out to support top heavy plants 
­storage roots­ hold a ton of carbohydrates 
­pneumatophores­ aerial roots that can absorb oxygen when above water at low tide 
~ Stems

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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 5
Description: Last weeks lectures
Uploaded: 02/19/2016
5 Pages 11 Views 8 Unlocks
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