Algae: Classification and Characteristics · NCERT Biology

What is the reason for the red color of Rhodophyceae?

  1. Predominance of fucoxanthin
  2. Predominance of chlorophyll a
  3. Predominance of anthocyanins
  4. Predominance of r-phycoerythrin
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Correct answer: Predominance of r-phycoerythrin

Red algae appear red because of the abundance of the pigment r-phycoerythrin in their bodies. This pigment allows them to absorb blue light, which penetrates deeper into the ocean.

Difficulty: Medium Question 10 of 20

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