Simple Algae

Simple Algae - Some are large enough to be seaweeds. Red...

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Simple Algae The term  algae  is not a formal biological term. It refers to a large number of photosynthetic  organisms that are generally unicellular, rather simple, and not classified with plants. The organisms  are plantlike, however, because they contain chloroplasts with chlorophyll. Most algae can be found  in the oceans, but freshwater forms are also abundant.  The simple algae are subdivided into several divisions (rather than phyla, like the protozoa):  Rhodophyta, Pyrophyta, Chrysophyta, Phaeophyta, and Chlorophyta. The  divisions are based in part  on the types of pigments and colors they have. Rhodophyta Rhodophyta is the division of red algae. These organisms are almost exclusively marine types. Most  are unicellular, but some multicellular forms grow anchored to rocks below the level of the low tide. 
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Unformatted text preview: Some are large enough to be seaweeds. Red algae carry on photosynthesis using chlorophyll a . The red pigments are very similar to those in many species of cyanobacteria. A derivative of red algae called agar is commonly used in bacteriological media in the laboratory. Pyrophyta Members of the Pyrophyta are dinoflagellates. Dinoflagellates are unicellular organisms that are usually surrounded by thick plates that give them an armored appearance. Two flagella move the organism. Many dinoflagellates are luminescent. When affected by sudden movements, they give off light. When optimal conditions exist in the oceans, the dinoflagellates reproduce at explosive rates. Their red pigments cause the water to turn the color of blood. This condition is the red tide...
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