Bellringer What are flagella and cilia used for?

Protists

Some absorb their food from their environment like fungi, some make their food like plants, and some eat their food like animals.

Protists All protists are eukaryotes. What does this mean? It means that they have a nucleus.

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.

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.

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

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.

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

6 kinds of plantlike protists Diatoms Dinoflagellates: have two flagella which are whiplike structures used for movement Euglenoids: have one flagella

Animal-like Protists These protists get their food by eating other organisms. Producer or consumer? Consumer.

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.

Animal-like Protists Flagellates: –Use a flagella to move –Many are parasites that cause disease Giardia lamblia

Animal-like protists Ciliates: –Contain cilia which are tiny hair-like structures that are used for movement and feeding. –Paramecium

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)

Reproduction in protists Some protists reproduce asexually by a process called fission. Some protists reproduce sexually through a process called conjugation.