Class Notes (838,689)
Canada (511,049)
Biology (2,271)
BIOL 120 (73)
Lecture 4

Lecture 4 Seedless Vascular Plants

4 Pages
66 Views
Unlock Document

Department
Biology
Course
BIOL 120
Professor
Simon Chuong
Semester
Winter

Description
Lecture 4 Notes Algae Solutions : - Phaeocystis: has high concentration of compounds that absorb ultraviolet light: PROTECTS the cell from damaged caused by UV irradiation. Gravity: - Strengths cell wall: by increasing lignin Seedless Vascular Plants (SVPS) - Lignins: (Bryophytes DO NOT have lignin • STRENGTHENS cell wall ( by replacing water and coating ) • Or ENCRUSTING the cellulose - Cellulose: principle building block of plants cell walls ( chains of glucose molecules) - Allows for INCREASE in SIZE and HEIGHT - In new Zealand: new fern found - EVOLUTION : paleobotanists (recovering plant from geological etc) not certain how SVPS evolved b/c fossil record = incomplete - Have a vascular system of • phloem (tissue that moves sugars and other organic nutrients from leaves to rest of the plants) • xylem : tissue that brings water and mineral nutrients from roots to rest of the plant - NO seeds/ flowers - Characteristic : • vascular tissue and waxy epidermis  Evolved from fresh water algae: over million of years - DOMINATED: (landscape) around 350 mya persisted as dominate plants for about 100 mya - Still needs WATER for fertilization - Today are about 5% living plant species Hypothesis for Seedless Vascular Plants - 450 mya: three extinct phyla appeared in fossil records - ALL had branching • Rhyniophytes PHOTOSYNTHETIC • Zosterophylls: ancestors to Phylum Lycophyta (Club STEMS without roots OR Mosses) Lycopodium leaves Order Isoetales: Quillworts , Order Selaginellales : Spike - From ancestral green Mosses algae of class Charophyceae • Trimerophytes : ancestors to 3 of 4 living phyla of SDV Phylum : Phylum Psilotophyta, Whisk ferns Phylum Sphenophyta: Horsetails Phylum Pterophta Ferns ( largest group of SVPS) Psilophyon dawsonii - Life Cycles: - Alternation of generations (all plants) - Sporophyte = DOMINANT - Gametophyte: reduced in physical sie - Sporophyte and gametophyte are INDEPENDET at maturity ( unlike bryophytes and seed plants) - Homosporous: produce only ONE type of spore (most SVPS) - Gametophyte: male,female, or bisexual • Short lived, small - Hetersporous : produce TWO types of spores : • Megaspores :
More Less

Related notes for BIOL 120

Log In


OR

Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


OR

By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.


Submit