Transcript Ferns
Exam #2 F 2/29 in class Review Th 2/28 5pm in PAI 3.02 Plant Evolution: different plants have different ploidy for the different parts of their lifecycle. CB 29.7 CB 29.8 and .12 Haploid dominant (algae) Diploid dominant (fern) CB 29.7 CB tbl 29.1 Extant Terrestrial Plants Moss CB 29.9 Extant early terrestrial plants Early terrestrial plants: •Could not transport water over long distances •Could not grow tall, lacked support •Needed water for reproduction Moss Life Cycle CB 29.8 Moss Life Cycle: water required for reproduction CB 29.8 CB 29.11 Early vascular plants CB 29.14 Extant early vascular plants CB 35.18 Plant vascular system: Xylem- water… (tough tubes, support) Phloem- sugars… Xylem- thick cells walls Xylem- thick cells walls Equisetum Equisetum Moss CB 29.13 Early Leaves: fusion of branched stems CB 29.1 Ferns Fern life cycle CB 29.15 Carnboniferous forest of ferns, etc. ~330 mya (now coal) Changes in atmospheric C02 CB 29.7 Seeds and pollen allowed gymnosperms to reproduce without water CB 30.4 Weird Gymnosperms CB 30.4 Conifers: More common Gymnosperms Gymnosperms disperse their pollen and seeds by wind Note: this is not a gymnosperm Gymnosperms disperse their pollen and seeds by wind CB tbl 29.1 Extant Terrestrial Plants Flowering Plants = 250,000 species Angiosperms- flowering plants The flower allowed angiosperms to direct pollen movement from one plant to another CB 30.7 a typical flower CB 30.13 Animal pollinators move pollen from one plant to another CB 30.13 Plants reproduce, reward animals with sugar http://plantsinmotion.bio.indiana.edu/plantmotion/flowers/flower.html CB 30.9 Seed dispersal can be by wind or often also by animal CB 30.8 Fruits: Animals can get nutrients to disperse seeds CB 30.10 Angiosperm reproduction Exam #2 F 2/29 in class Review Th 2/28 5pm in PAI 3.02