Protists (11)

-Simple -Eukaryotes -Single-celled -But can be joined together -They all live in moist environments because they have no protection against drying out. -They usually reproduce asexually (binary fission)

-Microscopic -Can be up to 100m long -Heterotrophs -Autotrophs

Unable to make their own food.

Able to make their own food.

Protozoa

Algae

-Simple, aquatic eukaryotes -Autotrophic (contain chlorophyll in chloroplasts to make food) -producers in the aquatic food chain -Release large quantities of oxygen during photosynthesis. -reproduce asexually -Algae can either be unicellular and microscopic or multicellular and macroscopic. -Algae are usually free floating -Some seaweeds are sessile (fixed)

Diatoms that have cell walls containing silica, and dinoflagellates that have flagellas and spirogyra.

Seaweeds

-Unicellular and microscopic -heterotrophs ~some ingest via phagocytosis for intracellular digestion such as amoeba. ~ Some absorb nutrients directly through cell membrane such as Plasmodium. ~Protozoans actively swim around looking for food)

Amoeboids, Ciliates, Flagellates, Parasites

They move and feed by means of temporary cytoplasmic projections called pseudopodia. E.g. Amoeba.

Use hair-like structures called cilia to swim and capture food, e.g. Paramecium.

Use flagella for locomotion, e.g. Giardia which causes a diarrhoeal illness.

Non-motile, e.g. Plasmodium which causes malaria.

The numerous micro-organisms floating in the oceans.

Plant-like unicellular protists (algae)

Animal-like unicellular protists (protozoans)