Enter your Sign-on user name and password.

Forgot password?
  • Follow us on:
Loading video...

Start Learning Now

Our free lessons will get you started (Flash® 10 required).
Get immediate access to our entire library.

Sign up for Educator.com

Features Overview

  • Get on-demand access to our complete library
  • Search and jump to exactly what you need to learn
  • Track your progress
  • Download practice and lesson files
  • *Ask questions and get answers from our community & instructors

Seedless Plants

  • Plants are multicellular eukaryotes and photosynthetic autotrophs. Plants evolved from ancestral green algae and exhibit numerous adaptations to life on land.
  • Plants are divided into two groups: nonvascular (bryophytes) and vascular (tracheophytes). In vascular plants the tube-like xylem and phloem transport water, minerals and nutrients.
  • The vascular plants are divided into the seedless vascular plants and the seed plants. The two groups of seed plants are the gymnosperms and the angiosperms (flowering plants).
  • Bryophytes are non-vascular plants such as mosses and liverworts. They lack true roots, leaves and stems.
  • In bryophytes the gametophyte stage is dominant. The sporophyte generation is dependent on the gametophyte plant.
  • Ferns are an example of a seedless vascular plant. They inhabit moist environments, allowing the flagellated sperm to swim to the archegonia where fertilization takes place.
  • Most seedless plants are homosporous; they produce a single type of spore that develops into a gametophyte capable of producing both male and female gametes.

Seedless Plants

Lecture Slides are screen-captured images of important points in the lecture. Students can download and print out these lecture slide images to do practice problems as well as take notes while watching the lecture.

AP Biology Intro