Algae are pigmented thallophytes. They prepare their own food materials with the help of chlorophyll and sunlight. So they are said to be autrotrophs. Besides chlorophyll there are other colored pigments in algae.
Depending on the pigments presents, algae are further classified into Blue green algae( Cyanobacteria), Brown algae (Phaeophyceae), green algae (Chlorophyceae), red algae (Rhodophyceae)and so on. Read more>>