Protists

1. Protists

2. What does these figures look like to you? • They actually are diatoms. • Provide food for whales

3. What is a protist? • Junk drawer kingdom. • They all are cells with a nucleus • All live in moist surroundings • Best described by DIVERSITY • Divided into three categories • Animal-like protists • Fungus-like protists • Plant-like protists

4. Animal-like Protists • What image pops into your head when you think of an animal? • Animal-like protists are heterotrophs. • Protozoan: able to move from place to place to obtain their food • Divided into groups based on the way they move and live

5. Protozons with pseudopods • Pseudopods: temporary bulges of the cell membrane that fill cytoplasm • Pseudopod means false foot • Pseudopods help organism respond to changes in the environment. • Ameba’s move with pseudopods

6. Protozoans with Cilia • Cilia: hair-like projections from cells that move with a wavelike pattern • Like oars or paddles of boat • Paramecium use cilia

7. Protozoans with Flagella • Flagella: whip like structure that assist with movement • Zooflagellates: have one to eight whip like flagella that help move • Many live inside bodies of other organisms • Giardia use flagella to move

8. Sporozoans • Live on the food and body fluids of the host • Move many different ways • Some have flagella • Some depend on host • One slides on slime it produces

9. Fungus-like Protists • “Sort of Like” organisms • Sort of like animals because they are heterotrophs • Sort of like plants because they have cells walls • Use spores to reproduce • Spore: tiny cell that is able to grow into a new organism • Three types • Water molds • Downy mildews • Slime molds

10. Water Molds & Downy Molds • Most live in water or moist places • Grow as tiny threads that look like a fuzzy covering • Can attack food crops like potatoes, cabbages, corn and grapes.

11. Slime molds • Live in moist soil and on decaying plants and trees • Move using pseudopods and ooze along the surface • Spore producing structures