Algae are photosynthetic, and almost all protozoans are heterotrophic. 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. (Concept 28.1) Zooplankton : Slime molds : Phytoplankton : … Algae are a diverse group of aquatic organisms that have the ability to conduct photosynthesis. characteristics of Chlorophyta (green algae), Rhodophyta (red algae), and Phaeophyta (brown algae, a photosynthetic heterokont). Algae, which live in water and whose larger forms are known as seaweed, is autotrophic. Plants are the most familiar type of autotroph, but there are many different kinds of autotrophic organisms. Green plants and photosynthetic bacteria are examples of photoautotrophs. An autotrophic protist is a type of single-celled organism that can create its own food. 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”. Only autotrophs can transform that ultimate, solar source into the chemical energy in food that powers life, as shown in Figure below. The best-known group is the algae. Photosynthetic autotrophs, which make food using the energy in sunlight, include (a) plants, (b) algae, and (c) certain bacteria. 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. 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. _____ are eukaryotic autotrophs that float near the surface of water and are the basis of the food chain. 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. These organisms are found in the supergroups Chromalveolata (dinoflagellates, diatoms, golden algae, and brown algae) and Archaeplastida (red algae and green algae). Learn about various types of autotrophs, including plants, autotrophic bacteria and algae. Photosynthesis provides over 99 percent of the energy for life on earth. Marine autotroph examples might spring to mind, like plankton, but even the flower growing in your backyard is an example of an autotroph. Autotrophs are important because they are a food source for heterotrophs (consumers). The algae are autotrophic protists that can be unicellular or multicellular. 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. When it comes to autotrophs, there are a lot of them out there. Photoautotroph Definition. Blue-green algae, any of a large, heterogeneous group of prokaryotic, principally photosynthetic organisms. 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 Cyanobacteria resemble the eukaryotic algae in many ways, including morphological characteristics and ecological niches, and were at one time treated as algae, hence the common name of Autotroph Types and Examples. 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