BIOA02H3 Lecture : Tree of Life (Very Detailed)
11 Jan 2012
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Bioa02: module 1 lecture 1: tree of life. 5 main groups of plants: bryophytes, lycophytes, ferns, gymnosperm, angiosperm, 1. 2 billion ago first photosynthetic precursors of plants (green algae) appears photosynthesis kicked off with production of oxygen and atmosphere which create environment conducive to life. Earliest type of plant = bryophtes however, don"t know exactly when they evolved (because they are soft therefore hard to find fossils) Four main groups of bryophytes: liverworts, mosses (2 kinds), hornworts. *don"t need to know number of species in each group but where they are relative to the number of species. Bryophytes like to grow in moist environments (forests, creeks) Liverworts: flattened bodies which grow right on top of soil, from flattened body they grow reproductive structures (umbrella-shaped: male grow antheridia where male reproductive structure is produced produced, female grow archegonia where male reproductive structure is. Mosses (the largest brypphyte group) examples: peat moss (found in moist environement)
