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Multicellular Algae

Multicellular Algae. Multicellular (mostly) Algae. Classified according to their photosynthetic pigments 3 Groups: 1)red algae 2)brown algae 3)green algae. Red Algae. Belong to phylum Rhodophyta Contain chlorophyll a and phycobilins Can live in deep water

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Multicellular Algae

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  1. Multicellular Algae

  2. Multicellular (mostly) Algae • Classified according to their photosynthetic pigments • 3 Groups: • 1)red algae • 2)brown algae • 3)green algae

  3. Red Algae • Belong to phylum Rhodophyta • Contain chlorophyll a and phycobilins • Can live in deep water • Efficient at absorbing light

  4. Brown Algae • Belong to phylum phaeophyta • Contain chlorophyll a & c as well as fucoxanthin • Example: kelp, Sargassum, Macrocystis

  5. Green Algae • Belong to phylum Chlorophyta • contain chlorophyll a and b, cellulose cell walls, store food as starch. • Very similar to land plants • Unicellular, colonial, and multicellular

  6. Unicellular green algae • Chlamydomonas

  7. Colonial green algae • Spirogyra grows in filaments • Volvox grows in hollow spheres

  8. MulticellularGreen algae • Ulva “sea lettuce”

  9. Reproduction in Algae • Life cycles of many algae include both a diploid and a haploid generation. • They also include a sexual and an asexual generation. • This life cycle is known as alternation of generations. • Plants follow this type of life cycle.

  10. Ecology of Algae • Major food source for life in the oceans • Produce much of Earth’s O2 • Some is eaten by humans (nori in sushi) or used to make food products like ICE CREAM!!! • Used to make many products such as plastics, paints, deodorants, etc…….

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