Class Notes (836,415)
Canada (509,777)
Biology (2,256)
BIOL 120 (73)
Lecture 4

Biol 120 - Lecture 4 Summary.pdf

2 Pages
Unlock Document

BIOL 120
Simon Chuong

Biol 120: Plant Biology   Lecture 4 Summary Ferns and Fern Allies – Seedless Vascular Plants. • The simplest of vascular plants – evolved alongside bryophytes ~ 450-700mybp. • Seedless Vascular Plants: vascular plants (plants with xylem and phloem) that produce neither flowers nor seeds, and are hence called vascular cryptogams. Instead, they reproduce and disperse only via spores. • vascular tissue: the tissue in higher plants that constitutes the vascular system, consisting of phloem and xylem, by which water and nutrients are conducted throughout the plant. • Sperm of ferns have tail-like structures and swim through water to reach the egg – Therefore they are WATER DEPENDENT for reproduction. • Lignin: a complex organic polymer composed of chains of glucose molecules, deposited in the cell walls of many plants (incl. SVP), making them rigid and woody. o Lignins allowed for an increase in size and height • SVP account for only 5% of living plant species today. Phyla • Psilotophyta – whisk ferns • Sphenophyta – horsetails • Pterophyta – Ferns • Lycopodium – club mosses; ancestors of extinct Zosterophylls • Isoetes - Quillworts Life Cycle • Sporophyte is dominant • Gametophyte is significantly reduced in size and short-lived • Sporophyte is independent at maturity • MOST Sporophytes are homosporous (releasing one type of spore) • Gametophytes can be bisexual or unisexual • Heterosporous Sporophyte have megasporangia with megaspores (large, becomes female gametop
More Less

Related notes for BIOL 120

Log In


Join OneClass

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

Sign up

Join to view


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.