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Phototaxis in Euglena Gracilis Abstract The unicellular flagetta Euglena gracilis E gracilis shows positive phototaxis We studied E gracilis to see its effects of photosynthesis under the compound microscope What I came up with is that E gracilis uses photosynthesis to make their food and to have a positive phototaxis While under the microscope we studied the number of E gracilis that went from light to shaded areas Our results were that the E gracilis has a positive phototaxis IntroductionIn this experiment we tested the reaction of E gracilis to light phototaxis What is E gracilis E gracilis is in the Kingdom Protista Phylum Mastiogophora Class Flagelleta Order Euglenophyta and Class Euglenoids Euglenoids are unicellular organisms whose classification as plants or animals can be debated equally either way Euglenophyta 1 They have similar characteristics of both plants and animals They are not related to any algae but because they occupy the same kinds of habitats as algae and are of comparable simplicity Euglenophyta 1 E gracilis lives in marine and fresh waters Their pigment is green a few are colorless- chl ab and carotenoids Euglenophyta 1 The most important Euglenoid parts are the nucleus chloroplasts flagellum cell wall eyespot and cell membrane Algae 1 They are single celled with different layers inside the cell wall They move by one long flagella Some Mastigophorans have many flagella up to six or more E gracilis are plant-like because they have chloroplasts but if the chloroplasts are removed or shaded from sunlight the E gracilis will hunt for food which makes them animal-like too Euglena 1 Euglena are light-sensitive and are a valuable food source for fish and other aquatic animals Euglenophyta 1 E gracilis rely on photosynthesis to survive They need photosynthesis to produce their food One would expect a positive phototaxis Phototaxis is the tendency to move toward light The purpose of studying E gracilis is
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