1. Protists

2. Amoeba An amoeba is a one-celled protozoan.
Look for tiny tan blobs on the slide.
Look for the structures in the next slides

3. Amoeba

4. Amoeba

5. 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

6. Amoeba Feeding
An amoeba surrounds another live organism with its pseudopod and takes it into a food vacuole

7. Amoeba Reproduction When an amoeba gets too large, it divides in half.
The nucleus splits, too.

8. Amoeba Size 600 um (micron) Two amoebas would almost fit in 1mm
1mm= 1000 um

9. 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

10. Paramecium

11. Paramecium

12. 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

13. Parmecium Feeding
A paramecium feeds on bacteria and other tiny organisms.
Cilia push the food into an opening called the oral groove

14. Paramecium Reproduction
When paramecium gets too large, it divides in half.
The nucleus also splits

15. Paramecium Size 180 to 300 um (micron)
3 to 5 paramecium would fit in 1mm

16. Euglena Euglenas are one-celled algae.
Look for tiny green organisms moving on the slide
Look for the structures in the next slides

17. Euglena

18. Euglena
Euglena movement:

19. 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

20. 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

21. Euglena Reproduction When euglena gets too large, it divides in half.
The nucleus also splits

22. Euglena Size
35um (micron)
1mm=100um

23. 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

24. Volvox

25. Volvox

26. Volvox Movement Each volvox cell has two flagella.
The flagella beat to roll the ball through the water

27. Volvox Feeding
Volvox cells have chlorophyll and make their own food by photosynthesis

28. 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

29. Volvox Size 350 to 500 um (micron)
2 or 3 volvox cells would fit in 1 mm