What is the basis of the classification of algae?

Answer: The primary foundation for classifying algae is whether they contain colours.

Chlorophyceae: They have chlorophyll a and b, which give them their green colour. Blue-green algae are another name for the Chlorophyceae family.

Chlorophylls A and C as well as Fucoxanthin are present in Phaeophyceae. Fucoxanthin is responsible for the brown hue. Brown algae are another name for the Phaeophyceae family.

Chlorophylls a and d as well as phycoerythrin are present in Rhodophycean. The colour red is given by phycoerythrin. Red algae is another name for the genus Rhodophycean.