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Download Kingdom Protista, Part 2
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Kingdom Protista, Part 2 Plant-like Protists (27-1 & 27-2) are classified by COLOR Phylum Chlorophyta • have both chlorophyll a and b (so they are green) • have cellulose cell walls • store carbohydrates as starch • have many types of sexual reproduction • exhibit many types of organization --Are thought to be the ancestors of plants-- Variations in Sexual Reproduction • Isogamous= both sperm and egg are motile and equal in size • Anisogamous= both sperm and egg are motile and differ in size • Oogamous= large, nonmotile egg and small, motile sperm Variations in Sexual Reproduction Phylum Chlorophyta organization 1. Unicellular 2. Filamentous 3. Colonial 4. Bi-layer Unicellular Green Algae Chlamydomonas Chlamydomonas Filamentous Green Algae Spirogyra has spiral-shaped chloroplasts another filamentous Green Algae Zygnema 2 Star-shaped chloroplasts per cells a colonial Green Algae … Volvox Mother colony with Daughter colonies Mother Colony Daughter Colony a bi-layered Green Algae Ulva (sea lettuce) a microscopic view of Ulva from the side from the top Harvesting Ulva Phylum Phaeophyta • • • • brown algae multicellular flagellated sperm cells Ex.: Fucus & Kelp Phylum Phaeophyta: Brown Algae ex.: Laminaria, Macrocystis, Kelp Air Bladders: Used to take blades to the surface for PSN Phylum Rhodophyta: Red Algae • are multicellular • contain red accessory pigments called phycobilins • gametes do not have flagella Phylum Bacillariophyta: Diatoms… have tests (shells) that contain silica (SiO2), or glass Diatom Strew Diatoms - a SEM picture Phylum Dinoflagellata • • • • formerly known as Pyrrophyta or fire algae have two flagella some are bioluminescent, producing light others produce nerve toxins – dinoflagellates are collected and concentrated in filter-feeding animals – people who eat these animals become sick Phylum Dinoflagellata ex. Peridinium Red Tideresults from a bloom of Peridinium Phylum Chrysophyta • Are golden yellow • Have one or two apical flagella Phylum Euglenophyta • have one to three flagella at their leading (apical) end • have thin protein strips called pellicles wrapped over their membranes • have an eyespot that permits them to swim toward light • can become heterotrophic when there is no light Euglena (arrow indicates anterior end) The Euglena uses a flagella as a means of locomotion.
