Lesson 11 Notes Protists

What we will look at: Amoeba Paramecium Euglena Volvox

Objectives Make a list of things you already know about microbes. Observe four species of living microorganisms called protists and identify their animal-like and plant-like characteristics. Observe, draw, and estimate the length of four protists. Create a cartoon using an Amoeba, Euglena, or Paramecium as the main character. Read about the importance of microorganisms in history. Read about the kingdom Monera and its significance to humans.

Protists all have: Cytoplasm Nucleus Reproduce asexually by cell division Vacuoles Food and water storage

B. Amoeboids PSEUDOPEDIA (false feet) .25 mm – 25 mm For movement & trapping of food .25 mm – 25 mm Thin cell membranes Ectoplasm: excrete wastes, absorb O2, eliminate CO2 Endoplasm: within cytoplasm Live on aquatic plants, moist ground, or as parasites on animals Contractile vacuole: eliminates excess water

C. Ciliates: Paramecium Single-celled Slipper-shaped Cilia: tiny hairs for movement and trapping of food Size of bacteria – 2 mm Oral groove: opening for food & bacteria Contractile vacuole

D. Flagellates: Euglena Single-celled 15 – 500 micrometers Contain nucleus, chloroplast, contractile vacuole, stigma (eyespot), one or more flagella Pellicle: wall allowing for change in shape Also absorption of food photosynthesis

E. Volvox Pond alga Spherical colonies 1000-3000 cells per Volvox Flagella 1 mm in diameter (width) Found in ponds, puddles Absorb food through cell surface Photosynthesis