PROTISTS

Diatoms

Commonalities / Differences in the Protist Kingdom

• All are eukaryotes (cells with nuclei).• Live in moist surroundings.• Unicellular or multicellular.• Autotrophs, heterotrophs, or both.• Some can move - others cannot.

3 categories of Protists

•Animal-like

•Fungus-like

•Plant-like

Animal-like Protists (Protozoans)

*Unicellular *Consumers

*Groups based on movement:

flagella, cilia, pseudopods

Protozoans with pseudopods• Pseudopods also called

‘false feet’ • Cytoplasm flows this

allows the protozoan to

move, dragging the rest

of the cell behind it.

Can form 2 pseudopods to surround & trap food. Food vacuole forms to break down food.

Pseudopods, cont.

• Example of a protozoa that uses pseudopods –

• Amoeba

Protozoans with cilia

• Cilia - hair like structures - help organisms move, get food and sense environment.

• Oral groove lined with cilia - moves food into food vacuole at end of oral groove.

• Example of protozoan w/ cilia: • Paramecium.

Protozoans with flagella

• Use long whip like “tail” called flagella to move.

Example of a protozoa with flagella Giardia

Found in contaminated water and can cause severe diarrhea

Other Protozoans• Some protozoans are parasites • Feed on cells & body fluids of hosts

Plasmodium (causes malaria) have more than 1 host: mosquitoes and then humans

Fungus like Protists

• Decomposers• Produce spore (seed like structures)

• have cell walls of chitin • Not in fungi kingdom

because they can move at one point in their lives.

•Fungus-like Protists example

Slime mold

Plantlike Protists

• Producers• unicellular to very large multicellular• Contain different pigments so they come

in different colors.

Green cholorphyll is common

• Euglena: • special type of algae -

when there is no sunlight they become consumers

Plantlike Protists

Flagella

Plant-like Protists example

Volvox

Diatoms

EuglenaDinoflagellates

Kelp-a.k.a. Seaweed