Plant Diversity: How Plants Colonized Land - PowerPoint PPT Presentation

1 / 9
About This Presentation
Title:

Plant Diversity: How Plants Colonized Land

Description:

Plant Diversity: How Plants Colonized Land The Origins of Plants Bryophytes The Origin of Vascular Plants Seedless Vascular Plants Overview Common characteristics ... – PowerPoint PPT presentation

Number of Views:209
Avg rating:3.0/5.0
Slides: 10
Provided by: Blu46
Category:

less

Transcript and Presenter's Notes

Title: Plant Diversity: How Plants Colonized Land


1
Plant DiversityHow Plants Colonized Land
  • The Origins of Plants
  • Bryophytes
  • The Origin of Vascular Plants
  • Seedless Vascular Plants

2
Overview
  • Common characteristics chloroplasts with
    pigments cell walls of cellulose plastids
  • Development of embryophytes
  • Alternation of generations
  • Nonvascular and vascular forms

3
Alternation of Generations
4
The Origin of Plants
  • Common ancestor with green algae based on
    similarities of cell walls and chloroplasts
  • Alternation of generations may have evolved from
    a delayed meiosis
  • Shallow water existence preadapted plants for a
    terrestrial lifestyle (waxy cuticle, protected
    gametes, protected embryo)

5
Plant Phylogeny
6
Bryophytes
  • Mosses, liverworts, and hornworts
  • Key evolutionary development protected gametes
  • Dominant gametophyte
  • Sporophyte dependent
  • amphibians of the plant kingdom?
  • Spores are dispersal mechanisms

7
The Origin of Vascular Plants
  • Dominant sporophyte
  • Regional specialization of the plant body (roots,
    leaves, etc.)
  • Structural support
  • Vascular system (xylem and phloem)
  • Seeds (in some)
  • Pollen (in some)
  • Two major lines seeds and seedless

8
Seedless Vascular Plants
  • Ferns, horsetails, and lycophytes
  • Still require water for fertilization
  • Dominant sporophyte
  • Independent, but reduced gametophyte
  • Spores are dispersal mechanisms
  • Formed coal forests during Carboniferous period

9
Life Cycle of a Fern
Write a Comment
User Comments (0)
About PowerShow.com