Week #4 notes
Popular in Life 103- Biology of Organisms
verified elite notetaker
Popular in Biology
This 2 page Class Notes was uploaded by email@example.com Notetaker on Friday February 5, 2016. The Class Notes belongs to 103 at Colorado State University taught by Tanya Dewey in Winter 2016. Since its upload, it has received 23 views. For similar materials see Life 103- Biology of Organisms in Biology at Colorado State University.
Reviews for Week #4 notes
Report this Material
What is Karma?
Karma is the currency of StudySoup.
You can buy or earn more Karma at anytime and redeem it for class notes, study guides, flashcards, and more!
Date Created: 02/05/16
Week 4 notes (Test was on Wednesday so this only includes Friday’s lecture) Horsetails -are everywhere except Asia and Australia -1 genus has 30 species -Were diverse during the carboniferous period Seeds -contains embryo surrounded by nutrients with a covering to protect it -Plants were able to become dominant produces with the evolution of the seed -seeds were important for civilizations since they contain nutrients Seed plants All have… -reduced gametophytes -heterospory -ovules -pollen alternation of generations The seed plants gametophytes grow in the spore’s walls that in the tissues of the parent sporophyte Ferns -sporophyte is dominant and big -gametophyte is small Gymnosperms -pollen inside plant is really small -dominant generation is sporophyte Heterospory -ancestors of seed plants were homosporous -seed plants are heterosporous Microsporangia microspores male gametophytes Megasporangia megaspores female gametophytes Ovules and eggs -ovule has… -megasporangium -megaspore -1 or more integumnents. An integument is a protective coating -gymnosperms have only 1 integuments Gymnosperm female -the megasporangium is dipliod and the megaspore is haploid -megaspore grows into the gametophyte Gymnosperm male -the microsporangium is diploid, and the microspores are haploid and are developed in the microsporangium -microspores develop into male gametophyte Gymnosperm fertilization The pollen grain will germinate once it comes in contact with the ovule. Then, a pollen tube grows, working through the megasporangium. When the pollen tube reaches the egg nucleus, sperm is released into the egg nucleus of the female gametophyte. Pollen -microspores develop into pollen grains -water is no longer needed to move sperm, wind and animals carry pollen. Evolutionary advantage of seeds -the sporophyte embryo has protection and a supply of food -seeds are able to remain dormant for centuries -ability to cover more ground via wind and animal; no longer rely on water Gymnosperms -seeds aren’t enclosed by ovaries 4 phyla -Cycadophyta -Gingkophyta -Gnetophyta -Coniferphyta Cycadophyta -Leaves tend to look palm like and they have large cones -There are few species around today, but during the Mesozoic period there were a lot -Only 300 species today -Plant collectors steal these Ginkgophyta -only 1 living species -resistant to air pollution -For 270 million years, leaves haven’t changed much
Are you sure you want to buy this material for
You're already Subscribed!
Looks like you've already subscribed to StudySoup, you won't need to purchase another subscription to get this material. To access this material simply click 'View Full Document'