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Kingdom Protista

Basic Characteristics

Brandon Houston

on 3 April 2013

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Transcript of Kingdom Protista

mostly unicellular organisms that do not fit into the other kingdoms Kingdom Protista Kingdom Protista Kingdom Protista Classified into 3 major groups based on how they get food
Animal-like: called protozoa; heterotrophic
Plant-like: called algae; autotrophic
Fungus-like: decomposer; external digestion Animal-Like Protists Zooflagellates
move using 1 or 2 flagella
absorb food across their membrane Protists in the Biosphere Plankton - microscopic organisms that float near the surface of oceans and lakes
Phytoplankton - small photosynthetic organisms found in great numbers near surface of ocean
Carry out 70% of earth’s photosynthesis
Plankton and phytoplankton are basic unit of oceanic food chain Animal-Like Protists Sarcodinians Plant-Like Protists green algae mostly unicellular, some multicellular (algae)
can be heterotrophic or autotrophic
most live in water
ALL are eukaryotic (have a nucleus) Characteristics ** A protist is any organism that is not a plant, animal or fungus Protista = the very first Protozoans Sarcodinians
move using extensions of cytoplasm called psuedopods ("false feet")
surround & engulf their food
reproduce asexually (binary fission) Classified based on how they move Ciliates
move using cilia
food gathered through a mouth
reproduces asexually or sexually (conjugation) Sporozoans
do not move
parasitic Plant-Like Protists Algae Fungus-Like Protists Slime Molds Ciliates Zooflagellates Sporozoan Diatoms Kelp
(brown algae) Euglena Fungus-Like Protists Slime Mold Divided into 2 groups:
Unicellular - classified by cell wall composition &/or external features
Multicellular - classified by pigment (color) Unicellular includes:
Diatoms - contain silica
Euglena - move with flagella
Gonyaulax - contain cellulose, cause "red tide" Multicellular includes:
Green algae - chlorophyll; in all waters
Red algae - accessory pigments (red); warm saltwater
Brown algae - accessory pigments (brown); cool saltwater Red Tide caused by Gonyaulax Diseases caused by protist:
Plasmodium - causes malaria
Trypanosoma - cause African sleeping sickness, affects nervous system; live in blood of mammals
Gonyaulax- causes “red tide”; produces toxins, can paralyze & kill humans that eat infected shellfish
Phytophthora - causes potato blight. Devastated crops of Ireland in mid 1800s Life cycle has stages:
fruiting body (reproductive)
feeding stage (plasmodium)
spores (survive harsh conditions) Act as decomposers Include:
acellular slime molds - unicellular
cellular slime molds - damp soil, decaying plant matter; ameba-like
water molds - freshwater, parasitic
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