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Multicellular Algae: The Plant-like Protists

This article delves into the fascinating world of multicellular algae, including Red Algae, Brown Algae, and Green Algae. Learn about their characteristics, human uses, and how they form symbiotic relationships. Discover the wonders of these plant-like protists!

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Multicellular Algae: The Plant-like Protists

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  1. IV. Plant-like protists : Multicellular Algae *Multicellular algae include : 1. Red Algae 2. Brown Algae 3. Green Algae -Multicellular algae are classified by color (photosynthetic pigments).

  2. Red Algae 1. Red algae (Rhodophyta) - type of algae that is red in color (contain chlorophyll a & reddish accessory pigments) & can be found in deep, warm waters. -The name Rhodophyta means “red plants”. -The accessory pigments of red algae are called Phycobilins – pigments that are good at absorbing blue light from the light spectrum. Is what allows them to live deeper in the ocean than other algae. -Help in the formation of coral reefs. -Make up most of our common seaweed, Ex : Agar (Petri dishes) & Carrageenan – used to prevent separation of food mixtures (chocolate & milk, ice cream).

  3. Brown Algae 2. Brown Algae (Phaeophyta) - type of algae that gets its color from brown pigments (chlorophylls a & c & fucoxanthin), Ex : Seaweed/Kelp. -Phaeophyta means “dusky plants”. -Most are marine & found in cool, shallow, coastal areas. Is the largest, most complex group of algae.

  4. Green Algae 3. Green Algae (Chlorophyta) - type of algae that is green in color (chlorophyll a & b) & has a cell wall made of cellulose, ex : Chlamydomonas – 2 flagella & pyrenoid, Volvox, & Ulva. -Name means “green plants”. -Share many of the characteristics of land plants, ex : have cellulose in cell walls & store food as starch. -Most live in fresh water (or land), some found in ocean. -Form colonies – groups of similar cells that are joined together but show few specialized structures. -Share symbiotic relationships with other organisms, ex : Fungi.

  5. Alternation of Generations -Most algae have a life cycle known as the alternation of generations. Alternation of generations – process in which many algae switch back & forth between haploid (n) & diploid (2n) stages of their life cycles.

  6. Human Uses for Algae : Human uses for algae include : Sushi, ice cream, salad dressing, pudding, candy (vitamin C), to treat stomach ulcers, high blood pressure, arthritis, & make plastics, waxes, lubricants, etc.

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