Photosynthetic organisms are organisms that use light energy to produce food. ALGAE is a type of photosynthetic organism that is found in aquatic environments. ALGAE are typically single-celled organisms, but can also form colonies or filaments. They are an important part of the food chain, providing food for many aquatic animals. ALGAE also play an important role in the global carbon cycle, as they absorb and store carbon dioxide from the atmosphere.