Algae Definition. About 5% of the red algae inhabit in freshwater environments. Good examples of algae include seaweed, giant kelp, and pond scum. They might be the unicellular cell, multicellular or may even live in … Algae may be unicellular or multicellular based on their type, and they reproduce either sexually or asexually. Algae belong to a paraphyletic group that is distinguished from the other groups of organisms by being aquatic, photosynthetic, eukaryotic organisms. 3. Algae exist in a variety of shapes and forms—single-celled algae may be spherical, rod-shaped, or spindle-shaped, while multicellular algae may appear as colonies, filaments or tubes. Unicellular organisms are thought to be the oldest form of life, with early protocells possibly emerging 3.8–4 billion years ago. Multicellular protists may include brown algae and certain red algae. The algae are classified into phyla based on their type of chlorophyll, the form of food-storage, the color of the algae and the cell wall composition. Brown Algae. Generally, algae possess chlorophyll but lack true roots, stems and leaves characteristic of the embryophytes. The Rhodophyta also comprises one of the largest phyla of algae, containing over 7,000 currently recognized species with taxonomic revisions ongoing. Algae are of excellent nutritional value since they contain complete protein, fiber, and sometimes high levels of omega-3 fatty acids, many vitamins and minerals. Unicellular algae : Algae are chlorophyll bearing thallophytes with autotrophic mode of nutrition. They include a wide range of organisms, i.e. from unicellular, to colonial, to multicellular forms. Many eukaryotes are multicellular, but many are unicellular such as protozoa, unicellular algae, and unicellular fungi. Examples: Porphyra, Gracilaria, and Gelidium. These organisms can occur as either single cell organisms or multicellular species for the large ones. Algae are the basically gigantic, miscellaneous assemblage of Photosynthetic eukaryotic organisms. Recent headlines claim, “Scientists Have Witnessed a Single-Celled Algae Evolve Into a Multicellular Organism.”1 In reality, the experiment showed that nothing more than a crude clumping together of individual cells had occurred. They are used as a stabilizer in milk products. Named for their beautiful spiral chloroplasts, spirogyras are filamentous algae that consist of thin unbranched chains of cylindrical cells. The thallus ranges from a single cell to very elaborate multicellular parenchymatous structure. Classification. Some examples of the phaeophytes are the laminaria and the fucus. Algae can be found in a wide range of environments such as moist soil, salt water, moist rock and fresh water. Organelles inside the cells carry out defined functions within the cell. Just as humans move from one place to another using our legs, algae move from one … For example, it is here where some protists receive energy from the sun to produce nutrients through a process called photosynthesis. Most of the algae are multicellular and marine algae (seaweeds). Red algae, or Rhodophyta (/ r oʊ ˈ d ɒ f ɪ t ə / roh-DOF-it-ə, / ˌ r oʊ d ə ˈ f aɪ t ə / ROH-də-FY-tə; from Ancient Greek ῥόδον (rhodon) 'rose', and φυτόν (phyton) 'plant'), are one of the oldest groups of eukaryotic algae. A new multicellular organism was not created, nor was any real evolution observed. Cells of protists have a nucleus which contains their genetic material. Spirogyra, any member of a genus of some 400 species of free-floating green algae found in freshwater environments around the world. The rhodophyta. Algae are a very diverse group of generally simple unicellular or multicellular eukaryotic organisms. 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