New User Special Price Expires in

Let's log you in.

Sign in with Facebook


Don't have a StudySoup account? Create one here!


Create a StudySoup account

Be part of our community, it's free to join!

Sign up with Facebook


Create your account
By creating an account you agree to StudySoup's terms and conditions and privacy policy

Already have a StudySoup account? Login here

Week #4 notes

by: Notetaker

Week #4 notes 103

User_160843_profile7723 Notetaker
GPA 3.7

Preview These Notes for FREE

Get a free preview of these Notes, just enter your email below.

Unlock Preview
Unlock Preview

Preview these materials now for free

Why put in your email? Get access to more of this material and other relevant free materials for your school

View Preview

About this Document

Lecture notes on seed plants, pollen, and gymnosperms.
Life 103- Biology of Organisms
Tanya Dewey
Class Notes
Week 4 notes; Life 103; Spring Semeseter 2016
25 ?




Popular in Life 103- Biology of Organisms

Popular in Biology

This 2 page Class Notes was uploaded by 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


Buy Material

Are you sure you want to buy this material for

25 Karma

Buy Material

BOOM! Enjoy Your Free Notes!

We've added these Notes to your profile, click here to view them now.


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'

Why people love StudySoup

Steve Martinelli UC Los Angeles

"There's no way I would have passed my Organic Chemistry class this semester without the notes and study guides I got from StudySoup."

Jennifer McGill UCSF Med School

"Selling my MCAT study guides and notes has been a great source of side revenue while I'm in school. Some months I'm making over $500! Plus, it makes me happy knowing that I'm helping future med students with their MCAT."

Bentley McCaw University of Florida

"I was shooting for a perfect 4.0 GPA this semester. Having StudySoup as a study aid was critical to helping me achieve my goal...and I nailed it!"

Parker Thompson 500 Startups

"It's a great way for students to improve their educational experience and it seemed like a product that everybody wants, so all the people participating are winning."

Become an Elite Notetaker and start selling your notes online!

Refund Policy


All subscriptions to StudySoup are paid in full at the time of subscribing. To change your credit card information or to cancel your subscription, go to "Edit Settings". All credit card information will be available there. If you should decide to cancel your subscription, it will continue to be valid until the next payment period, as all payments for the current period were made in advance. For special circumstances, please email


StudySoup has more than 1 million course-specific study resources to help students study smarter. If you’re having trouble finding what you’re looking for, our customer support team can help you find what you need! Feel free to contact them here:

Recurring Subscriptions: If you have canceled your recurring subscription on the day of renewal and have not downloaded any documents, you may request a refund by submitting an email to

Satisfaction Guarantee: If you’re not satisfied with your subscription, you can contact us for further help. Contact must be made within 3 business days of your subscription purchase and your refund request will be subject for review.

Please Note: Refunds can never be provided more than 30 days after the initial purchase date regardless of your activity on the site.