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Green algae : plants fresh water or marine . the various forms are like unicellular motile, non motile , colonial, parenchymatous Red algae: These are most showy of sea weeds and are predominantly marine. Colour is due to presence of red pigment and a blue pigment in the chromatophores Example polysiphonis,gelidium
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Red algae:-They are “Red” because they seem red in color mainly due to the presence of pigments phycoerythrin, a reddish pigment.Found mainly in sea water.

Green algae:-They appear green in color because they contain chlorophyll pigments, similar to plants.
 Most of the green algae are found in fresh water.
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