11rotists:12Exercise 2: The AlgaeAlgae are autotrophic(photosynthetic) organisms. Like theprotozoa, some algae are single-celled. Unlike the protozoa however, many algae are multicellular andmay be quite large. Most algae live in water, but they may also be found in any place that is moist atleast part of the time. Algae are around us all the time and can be found on shady brick walls, the fur ofsome mammals, in swimming pools, birdbaths, flowerpots, and gutters on the roof. Over 30,000 species of algae have been described by Phycologists (Phycology is the study of algae). Like the protozoa, taxonomists need away to divide up all these species. The way they do it is by color and by how complicated the algae is.Divisions of algae by color.Different species of algae use different types and mixes of chlorophyll and this leads to their being different colors. Based on color, thereare four main groups of algae. They are: A.Green algaeB.Brown algaeC.Golden-brown algaeD.Red algaeLook at the seaweed the next time you’re at the beach. The four colors are usually pretty easy to find. Divisions of algae by complexity.In addition to being different colors, some algae are more complex than others. Algae can be divided into the following four categoriesbased on the complexity of the organism:A.Unicellular algaeConsist of only one cell living on its own.B.Colonial algaeConsists of a colony or cluster of more or less identical cells.Each cell could live on its own, but they choose to live together.C.Filamentous algae Consists of a long chain of more or less identicalcells. Again, each cell could live on its own, but they choose to live together.