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Exercise · Q7

Q.Complete the following table about the three groups of algae: Groups of algae: Chlorophyceae, Phaeophyceae, Rhodophyceae
  1. Stored food -- Chlorophyceae: Starch; Phaeophyceae: ______; Rhodophyceae: ______
  2. Cell Wall -- Chlorophyceae: ______; Phaeophyceae: Cellulose and algin; Rhodophyceae: ______
  3. Major pigments -- Chlorophyceae: ______; Phaeophyceae: ______; Rhodophyceae: Chl-a, d and Phycoerythrin

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Each blank is filled from the class-specific description given for Chlorophyceae, Phaeophyceae and Rhodophyceae.

Stored food. Chlorophyceae store food as true starch (given). Phaeophyceae store mannitol, laminarin and starch. Rhodophyceae store Floridean starch, a form unique to red algae.

Cell wall. Chlorophyceae have a cellulose cell wall. Phaeophyceae have cellulose, fucans and algin (given). Rhodophyceae have cellulose and pectin glued together with other carbohydrates.

Major pigments. Chlorophyceae carry chlorophyll a and b. Phaeophyceae carry chlorophyll a and c along with fucoxanthin. Rhodophyceae carry chlorophyll a and d along with phycoerythrin (given).

FeatureChlorophyceaePhaeophyceaeRhodophyceae
Stored foodtrue starchmannitol, laminarin, starchFloridean starch

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