Protists
Amoeba An amoeba is a one-celled protozoan. Look for tiny tan blobs on the slide. Look for the structures in the next slides
Amoeba
Amoeba
Amoeba Movement An amoeba moves with pseudopods (false feet). It extends a “foot” of cytoplasm in one direction and the rest of the body flows into that area
Amoeba Feeding An amoeba surrounds another live organism with its pseudopod and takes it into a food vacuole
Amoeba Reproduction When an amoeba gets too large, it divides in half. The nucleus splits, too.
Amoeba Size 600 um (micron) Two amoebas would almost fit in 1mm 1mm= 1000 um
Paramecium A paramecium is a one-celled protozoan. Look for organisms that are shaped like the sole of a shoe Look for the structures in the next slides
Paramecium
Paramecium
Paramecium Movement The cell is covered with cilia The cilia beat back and forth to move the cell A paramecium moves like a bumper car
Parmecium Feeding A paramecium feeds on bacteria and other tiny organisms. Cilia push the food into an opening called the oral groove
Paramecium Reproduction When paramecium gets too large, it divides in half. The nucleus also splits
Paramecium Size 180 to 300 um (micron) 3 to 5 paramecium would fit in 1mm
Euglena Euglenas are one-celled algae. Look for tiny green organisms moving on the slide Look for the structures in the next slides
Euglena
Euglena Euglena movement: http://silicasecchidisk.conncoll.edu/LucidKeys/Carolina_Key/html/Euglena_Main.html
Euglena Movement Euglena have an eyespot that detects light. This helps the euglena find bright areas to gather sunlight to make their food. A euglena moves by whipping its flagellum around like a helicopter propeller
Euglena Feeding A euglena has chloroplasts that contain chlorophyll When light is available, the euglena makes its own food the way a plant does When there isn’t enough light for photosynthesis, euglena acts like an animal and captures its food
Euglena Reproduction When euglena gets too large, it divides in half. The nucleus also splits
Euglena Size 35um (micron) 1mm=100um
Volvox Volvox are one-celled algae that live together in a colony The colony is a hollow ball with 500 to 20,000 individual cells Look for the rolling green balls under a microscope Look for the structures in the next slides
Volvox
Volvox
Volvox Movement Each volvox cell has two flagella. The flagella beat to roll the ball through the water
Volvox Feeding Volvox cells have chlorophyll and make their own food by photosynthesis
Volvox Reproduction Daughter colonies are small, dark green balls inside the volvox colony When the daughter colonies mature, the parent ball bursts open and releases the daughter colonies
Volvox Size 350 to 500 um (micron) 2 or 3 volvox cells would fit in 1 mm