Algae are classified based on their photosynthetic pigments.

The correct option is A True

Algae:

1. Algae are photosynthetic eukaryotes.
2. Algae are classified into the following groups based on their photosynthetic pigments:
3. Chlorophyceae are green algae that contain chlorophyll a, chlorophyll b, and zeaxanthin.
4. Phaeophyceae: Brown algae that contain chlorophyll a, chlorophyll c, beta-carotene, and xanthophyll (fucoxanthin is dominant).
5. Rhodophyceae are red algae that contain chlorophyll a, chlorophyll d, and r-phycoerythrin.

Final answer: The given statement is true.