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Bellringer What are flagella and cilia used for?
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Protists
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Some absorb their food from their environment like fungi, some make their food like plants, and some eat their food like animals.
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Protists All protists are eukaryotes. What does this mean? It means that they have a nucleus.
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Protists Protists are unicellular or very simple multicellular organisms Protists can be producers or consumers. What is a producer? A producer makes its own food. What is a consumer? A consumer cannot make its own food; they have to get their food from something else.
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Funguslike Protists These protists absorb their food from dead organisms or from other organisms like fungi do. So, are they producers or consumers? Consumer A consumer that gets its food from dead organisms is called a decomposer. These protists secrete digestive juices onto the food source and then absorb the nutrients.
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Funguslike Protists Slime mold: look like colorful, shapeless globs of slime –Eat bacteria, fungi, and bits of dead plants Water mold: live in water –Most are parasitic, meaning that they invade other organisms to obtain food
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Plantlike Protists This group of protists uses sun’s energy in a process called photosynthesis to make energy. Are these protists producers or consumers? Producers Plantlike protists are also known as algae.
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6 kinds of plantlike protists Red Algae: most of the world’s seaweeds are red algae, they live mainly in tropical waters Brown algae: seaweeds found in cooler water Green algae
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6 kinds of plantlike protists Diatoms Dinoflagellates: have two flagella which are whiplike structures used for movement Euglenoids: have one flagella
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Animal-like Protists These protists get their food by eating other organisms. Producer or consumer? Consumer.
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Animal-like protists Amoeba: –soft, jellylike protist –Found in fresh and salt water –Move with a pseudopodia, which is protrusion of jelly that helps the amoeba to move. –Amoebas feed by surrounding and engulfing their food.
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Animal-like Protists Flagellates: –Use a flagella to move –Many are parasites that cause disease Giardia lamblia
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Animal-like protists Ciliates: –Contain cilia which are tiny hair-like structures that are used for movement and feeding. –Paramecium
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Animal-like protists Spore-forming protists –All are parasites –They release spores which are reproductive cells protected by a thick wall –Usually lives between two hosts. –Example: Plasmodium vivax (malaria)
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Reproduction in protists Some protists reproduce asexually by a process called fission. Some protists reproduce sexually through a process called conjugation.
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