•unicellular•live in water

•3 types:

• Protozoa• Algae• Slime moulds.

•Protists

Protozoa

Algae

Slime mould

ProtistaProtista

1. Protozoans – 1. Protozoans – Animal-like ProtistsAnimal-like Protists• 2 kinds:

i) Amoebai) Amoebafeed on small organisms like

bacteria, engulf them.

• are able to move

ii) Parameciumii) Parameciumfound in pond watermove around by using cilia (hair-

like covering).

2. Algae (Plant-Like Protists)2. Algae (Plant-Like Protists)• chlorophyll-containing • range in size from single cells to

giant seaweeds 60 metres in length.

• could be classified as plants, except lack leaves, stems, roots.

• Algae

i) Brown Algaei) Brown Algae

multicellularmany species can be quite largeex Kelp

ii) Diatomsii) Diatoms

smallunicellularover 10, 000 species.

iii) Red Algaeiii) Red Algaemulticellularfound in warmer seawateris toxic, kills many fish

3. 3. Slime Moulds and Water Slime Moulds and Water MouldsMoulds

• are similar to fungi (produce spores), plants (have cellulose cell walls) and animals (glide around to ingest food) in some ways.

• they generally live off of decaying matter.

Slime MouldsSlime Moulds

Protist ParasitesProtist Parasites

parasite:something that lives inside and harms its hosthost: what the parasite infectsvector:an organism that carries a parasite and infects other things with it

MalariaMalariaplasmodiummosquitos are vectorlives in bloodstream and can kill

host if not treated1.5 – 2 million deaths/yr (more

than AIDS)prevented with bednetstreated with anti-malarial drugs

monsters-inside-me-malaria-parasite.html

TrypanosomaTrypanosomacause African Sleeping Sicknessvector is Tse Tse flycan infect the nervous system, killing

the hostmonsters-inside-me-african-sleeping-

sickness.html

GiardiaGiardiaparasite in

untreated drinking water

lives in digestive system

causes severe vomiting and diarrhea

CryptosporidiumCryptosporidiumparasite in

infected watercauses diarrheaforms a hard

spore that’s difficult to kill

monsters-inside-me-the-cryptosporidium-parasite.html