The algae are autotrophic protists that can be unicellular or multicellular. Autotrophs are important because they are a food source for heterotrophs (consumers). An autotrophic protist is a type of single-celled organism that can create its own food. When it comes to autotrophs, there are a lot of them out there. Photosynthetic organisms are divided into two broad groups according to the nature of the source of these electrons. characteristics of Chlorophyta (green algae), Rhodophyta (red algae), and Phaeophyta (brown algae, a photosynthetic heterokont). Unicellular algae … Photoautotrophs are organisms that can make their own energy using light and carbon dioxide via the process of photosynthesis.The word photoautotroph is a combination of autotroph, the word for an organism that makes its own food, and the prefix photo-, which means “light”. 3 Heterotrophs • Organisms that depend on external source of organic compounds • Earth ± s earliest life forms must have obtained their raw materials and energy from the primeval seas. Only autotrophs can transform that ultimate, solar source into the chemical energy in food that powers life, as shown in Figure below. Algae are a diverse group of aquatic organisms that have the ability to conduct photosynthesis. These organisms are found in the supergroups Chromalveolata (dinoflagellates, diatoms, golden algae, and brown algae) and Archaeplastida (red algae and green algae). Blue-green algae, any of a large, heterogeneous group of prokaryotic, principally photosynthetic organisms. Plants are the most familiar type of autotroph, but there are many different kinds of autotrophic organisms. Algae, which live in water and whose larger forms are known as seaweed, is autotrophic. An autotroph is an organism that can produce its own food using light, water, carbon dioxide, or other chemicals.Because autotrophs produce their own food, they are sometimes called producers. Marine autotroph examples might spring to mind, like plankton, but even the flower growing in your backyard is an example of an autotroph. Algae are photosynthetic, and almost all protozoans are heterotrophic. Introduction to Protists Protista comprises an assortment of primitive unicellular, colonial, and multicellular eukaryotes including simple photoautotrophic1 organisms (i.e.. algae), protozoa (mobile, heterotrophic, and _____ are eukaryotic autotrophs that float near the surface of water and are the basis of the food chain. There are several possible forms, these include unicellular, colonial and filamentous organisms. Autotroph Types and Examples. Autotrophic Protists - Algae There are many different types of algae that differ according to their body form, the type of photosynthetic pigments they use and variations in their flagella. The best-known group is the algae. 2 . Photoautotroph Definition. (Concept 28.1) Zooplankton : Slime molds : Phytoplankton : … For the most part, autotrophs often make their own food by using sunlight, carbon dioxide, and water to form sugars which they can use for energy. Green plants and photosynthetic bacteria are examples of photoautotrophs. Algae are prokaryotes, and protozoans are eukaryotes. One group includes the higher plants, eukaryotic algae, and the cyanobacteria (blue-green algae); these organisms contain the pigment chlorophyll a and use water as their electron source in reactions that generate oxygen. 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