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The presence or absence of pigments which impart colour to the algae forms the main basis of classification of algae.

Classification of Algae:

Class

Pigments Present

Colour

1. Cyanophyceae (Blue Algae)

Phycocyanin

Blue

2. Chlorophyceae (Blue Green Algae)

Chlorophyll-a and b

Green

3. Phaeophyceae (Brown Algae)

Chlorophyll-a, c and Fucoxanthin

Brown

4. Rhodophyceae (Red Algae)

Chlorophyll-a, d and Phycoerythrin

Red

 

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