BIOL120 Lecture Notes - Lecture 4: Rachis, Microphyll, Lycopodiophyta
2 May 2014
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Document Summary
Phaeocystis: has high concentration of compounds that absorb ultraviolet light: Protects the cell from damaged caused by uv irradiation. Lignins: (bryophytes do not have lignin: strengthens cell wall ( by replacing water and coating , or encrusting the cellulose. Cellulose: principle building block of plants cell walls ( chains of glucose molecules) Allows for increase in size and height. Evolution : paleobotanists (recovering plant from geological etc) not certain how. Have a vascular system of: phloem (tissue that moves sugars and other organic nutrients from leaves to rest of the plants) xylem : tissue that brings water and mineral nutrients from roots to rest of the plant. Characteristic : vascular tissue and waxy epidermis. Evolved from fresh water algae: over million of years. Dominated: (landscape) around 350 mya persisted as dominate plants for about 100 mya. 450 mya: three extinct phyla appeared in fossil records: rhyniophytes, zosterophylls: ancestors to phylum lycophyta (club. Order isoetales: quillworts , order selaginellales : spike.
