Protists

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

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 –A–Animal-like protists –F–Fungus-like protists –P–Plant-like protists

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

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

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

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

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

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

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.

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