4 major groups 1. Bryophytes are mosses, seedless and disperse by haploid spores 2. Seedless vascular plants are ferns, etc. Xylem carries water and minerals Phloem carries dissolved sugars, etc. Lignin strengthens cell walls Disperse by spores, diversified in Silurian and Devonian periods 3.
Gymnosperms are pine trees and other cone bearers.
Angiosperms are flowering plants. Produce seeds after flowering. Vascular Alternation of generations - characteristic of plants. Life cycle alternates between multicell haploid and multicell diploid forms. Haploid is the gametophyte generation - produces haploid gametes by mitosis in male antheridia and female archegonia.