The Diversity of Life I. A Brief History of Life II. Classifying Life III. The Prokaryote Domains: Bacteria and Archaea IV. The Domain Eukarya D. Plants: 1. Green algal ancestors The Diversity of Life I. A Brief History of Life II. Classifying Life III. The Prokaryote Domains: Bacteria and Archaea IV. The Domain Eukarya D. Plants: 1. Green algal ancestors Alternation of generation IV. The Domain Eukarya D. Plants: 1. Green algal ancestors 2. Colonization of Land: Environmental Differences Aquatic HabitatsTerrestrial Water availableDesiccating Sunlight absorbedSunlight available Nutrients at DepthNutrients available BuoyantLess Supportive Low oxygenHigh O 2 CO 2 diffuses slowlyCO 2 diffuses quickly IV. The Domain Eukarya D. Plants: 1. Green algal ancestors 2. Colonization of Land: Environmental Differences Nutrients (released by decomposition) are available at depth Light and oxygen are available at the surface; algae limited by lack of nutrients IV. The Domain Eukarya D. Plants: 1. Green algal ancestors 2. Colonization of Land: Environmental Differences Nutrients (released by decomposition) are available at depth Light and oxygen are available at the surface; algae limited by lack of nutrients Nutrient inputs from the landscape (fertilizer runoff) cause algal blooms and dead zones in marine environments.dead zones IV. The Domain Eukarya D. Plants: 1. Green algal ancestors 2. Colonization of Land: Environmental Differences Water in soil nutrients in soil Terrestrial environments provide photosynthetic organisms with more light, oxygen, and nutrients, but it is DESICCATING IV. The Domain Eukarya D. Plants: 1. Green algal ancestors 2. Colonization of Land: Environmental Differences 3. Plant Evolution Adapting to Land IV. The Domain Eukarya D. Plants: 1. Green algal ancestors 2. Colonization of Land: Environmental Differences 3. Plant Evolution Adapting to Land 4. Non-tracheophytes a. Groups i. Liverworts ii. Hornworts iii. Mosses IV. The Domain Eukarya D. Plants: 1. Green algal ancestors 2. Colonization of Land: Environmental Differences 3. Plant Evolution Adapting to Land 4. Non-tracheophytes a. Groups b. Characteristics - lack vascular tissues (xylem and phloem) - inefficient water transport - short - lack true organs (defined by the presence of vascular tissue) - some have a very thin waxy cuticle - some have stomates rning/resources/plant_form_fu nction/plant_form/vascular_gr ound_tissues.html XYLEM IV. The Domain Eukarya D. Plants: 4. Non-tracheophytes a. Groups b. Characteristics - release flagellated sperm directly into the environment - have a dominant gametophyte generation, and a short-lived, ephemeral sporophyte IV. The Domain Eukarya D. Plants: 4. Non-tracheophytes a. Groups b. Characteristics - release flagellated sperm directly into the environment - have a dominant gametophyte generation, and a short-lived, ephemeral sporophyte plants.html Liverwort spores from Argentina, 470 mya Rubinstein, et. al Early Middle Ordovician evidence for land plants in Argentina (eastern Gondwana). New Phytologist 188: IV. The Domain Eukarya D. Plants: 4. Non-tracheophytes a. Groups b. Characteristics c. History IV. The Domain Eukarya D. Plants: 4. Non-tracheophytes 5. Tracheophytes a. Characteristicsmaterials-in-plants.html Vascular tissue: Xylem: water up Phloem: sugars down IV. The Domain Eukarya D. Plants: 4. Non-tracheophytes 5. Tracheophytes a. Characteristics Dominant Sporophyte IV. The Domain Eukarya D. Plants: 4. Non-tracheophytes 5. Tracheophytes b. Groups i. Lycopodiophytes: (one vein per leaf ) ii. Euphyllophytes: (multiple veins per leaf) IV. The Domain Eukarya D. Plants: 4. Non-tracheophytes 5. Tracheophytes b. Groups i. Lycopodiophytes Barangwanathia 420 mya Lepidodendron was a canopy species (100 ft tall, 3ft in diameter) in the Carboniferous Period ( mya); ferns and other Lycophytes were in the understory. IV. The Domain Eukarya D. Plants: 4. Non-tracheophytes 5. Tracheophytes b. Groups i. Lycopodiophytes Lycopodium, a Clubmoss Selaginella, a Spikemoss Isoetes, a quillwort IV. The Domain Eukarya D. Plants: 4. Non-tracheophytes 5. Tracheophytes b. Groups i. Lycopodiophytes IV. The Domain Eukarya D. Plants: 4. Non-tracheophytes 5. Tracheophytes b. Groups i. Lycopodiophytes