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3 Kingdom Protista.notebook
1
November 02, 2010
Diversity
THE LIFE OF A PROTIST• Kingdom Protista consists of organisms that don't seem to fit
anywhere else.o They are simply eukaryotes that are not fungi, plants, or animals.o They are so diverse that some argue they should be split into
additional kingdoms.
Kelp Forest
Sea Palm (Brown Algae)
Water Mold
Trypanosomes
Dulse
Ulva (Sea Lettuce)
Diversity
• Protists are some of the earliest organisms on Earth. The first eukaryotic cells are thought to have been protists. They gave rise to fungi, plants, and animals.
• Most protists are small, single-celled organisms that are not necessarily related to one another.
• Protists are eukaryotes that lack the specialized features of fungi, plants, and animals, although they do have membrane-bound organelles.
Characteristics
• The three large taxonomic groups of protists, based on how they obtain nutrition, show huge diversity:o Plant-like
§ Mostly non-motile; photosynthetic.§ Often called algae or seaweeds.
o Animal-like protists§ All motile heterotrophs.§ Includes sarcodines (e.g., Amoeba proteus), ciliates (e.g.,
Paramecium caudatum), and flagellates (e.g., Euglena sp.).o Fungus-like
§ These heterotrophs obtain nutrition by extracellular digestion.§ These grow in dark, shady habitats and are called slime molds.§ Most are colorful and can be found underneath rotting logs or leaves.
Kelp
Amoeba
Euglena
Kelp
Nereocystis luetkeanaBack
Amoeba
Amoeba proteus
Back
Paramecium
Paramecium caudatumBack
3 Kingdom Protista.notebook
2
November 02, 2010
Euglena
Euglena gracilisBack
Slime mold
Resp/Nutr
RESPIRATION• Protists are almost exclusively aerobic. NUTRITION• Various feeding strategies:
o Some have chloroplasts and manufacture food like plants.o Others ingest food like animals.o Others absorb food like fungi.
REPRODUCTION• All are capable of asexual reproduction but some reproduce sexually as well.
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