The members of rhodophyceae are commonly called red algae because of the predominance of the red pigment, r-phycoerythrin in their body. Majority of the red algae are marine with greater concentrations found in the warmer areas. They occur in both well-lighted regions close to the surface of water and also at great depths in oceans where relatively little light penetrates.
Adjacent to a frequently-asked paragraph in the same chapter.
Which pigment is responsible for the reddish appearance of red algae?
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