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Catchall Kingdom: Algae

Algae are autotrophic organisms that are not considered plants. They often contain pyrenoids and can have unicellular or multicellular structures. Algae can reproduce through asexual and sexual means. The phylums of algae include Chlorophyta, Phaeophyta, Rhodophyta, Bacillariophyta, Dinoflagellata, and Chrysophyta. Chlorophyta, also known as green algae, gave rise to land plants. Phaeophyta, or brown algae, are marine organisms that store food as laminarin. Rhodophyta, or red algae, have various colors and some are used in cosmetics and food products. Bacillariophyta are diatoms, important phytoplankton in marine ecosystems. Dinoflagellata, or dinoflagellates, are unicellular organisms that can be photosynthetic and cause red tide. Chrysophyta are golden algae found in freshwater and are important for forming petroleum deposits. Euglenophyta, or euglenoids, have characteristics of both plants and animals. This presentation also briefly mentions slime molds, water molds, and chytrids.

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Catchall Kingdom: Algae

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  1. Catchall Kingdom: Algae www.assignmentpoint.com

  2. Algae www.assignmentpoint.com

  3. Characteristics of Algae • Autotrophic • Not plants – why? • Often contain pyrenoids www.assignmentpoint.com

  4. Structure of Algae • Thallus or body • Unicellular or multicellular • Colonial: Volvoz • Filamentous: Spirogyra • Multicellular: Ulva • Asexual and sexual reproduction www.assignmentpoint.com

  5. Phylums • Phylum Chlorophyta • Phylum Phaeophyta • Phylum Rhodophyta • Phylum Bacillariophyta • Phylum Dinoflagellata • Phylum Chrysophyta • Phyla Euglenohyta www.assignmentpoint.com

  6. Phylum Chlorophyta • Look • familiar? www.assignmentpoint.com

  7. Continued… • Green algae • Many different forms • Gave rise to land plants – why? • Choroplasts that contain a and b cholorphyll • Have carotenoids • Cell walls of cellulose www.assignmentpoint.com

  8. Ulva www.assignmentpoint.com

  9. Colonial Chlorophyta www.assignmentpoint.com

  10. Phylum Phaeophyta • Brown algae • Marine • Seaweed and kelps • Cooler areas of ocean • Fucoxanthin pigment • Store food as laminarin • ALL multicellular • Stemlike stipe • Leaflike region called blade www.assignmentpoint.com

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  12. Phylum Rhodophyta • Red algae but colors vary • Marine seaweeds • Smaller than brown algae and live in deeper waters • Phycobilins – pigment for absorbing light • Some coated with polysaccharide carageenan – cosmetics, gel capsules, cheeses • Agar – extracted from cell walls of red algae www.assignmentpoint.com

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  15. Phylum Bacillariophyta • Diatoms • Shells fit together like a box with a lid • Centric and pennate • Main component of phytoplankton • Diatomaceous earth www.assignmentpoint.com

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  17. Phylum Dinoflagellata • Dinoflagellates • Small, unicellular • Most photosynthetic • Some bioluminescent • Red tide a problem www.assignmentpoint.com

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  20. Phylum Chrysophyta • Golden algae • Most fresh water • Form cysts • 2 flagella • Carotenoids give color • Important for formation of petroleum deposits www.assignmentpoint.com

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  24. Phylum Euglenophyta • Euglenoids • Plant-like and animal-like characteristics • Many have cholorphyll and are photosynthetic • No cell wall, motile • Most live in fresh water • See picture on page 533 www.assignmentpoint.com

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  27. Slime molds: Phylum acrasiomycota Cellular slime molds Amoeboid movement Phylum Myxomycota Plasmodial slime molds Mass of plasmodium Water molds Phylum Oomycota Blight Phylum Chytridiomycota Chytrids Zoospores with one flagellum Maybe fungi? Fungus-like protists www.assignmentpoint.com

  28. Slime molds www.assignmentpoint.com

  29. Water molds www.assignmentpoint.com

  30. Chytrids www.assignmentpoint.com

  31. The END…. www.assignmentpoint.com

  32. This powerpoint was kindly donated to www.worldofteaching.com http://www.worldofteaching.com is home to over a thousand powerpoints submitted by teachers. This is a completely free site and requires no registration. Please visit and I hope it will help in your teaching. www.assignmentpoint.com

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