Presentation on theme: "19.1 Diversity of Protists KEY CONCEPT Kingdom Protista is the most diverse of all the kingdoms."— Presentation transcript:
19.1 Diversity of Protists KEY CONCEPT Kingdom Protista is the most diverse of all the kingdoms.
19.1 Diversity of Protists Protists can be animal-like, plantlike, or funguslike. Protists are eukaryotes (meaning they have a nucleus and other organelles) that are not animals, plants, or fungi.
19.1 Diversity of Protists Animal-like protists consume other organisms. –They are called heterotrophs –They are often predators.
19.1 Diversity of Protists Plantlike protists are photosynthetic. –single-celled, colonial, or multicellular –no roots, stems, or leaves KelpDiatoms
19.1 Diversity of Protists Funguslike protists decompose dead organisms. –heterotrophs –can move, whereas fungi cannot
19.1 Diversity of Protists Protists are difficult to classify. Protista is often called one kingdom But it may be broken down into more than one after scientists learn more about them.
19.1 Diversity of Protists Protist classification will likely change. –Some protists are not closely related. –Molecular evidence supports reclassification. Know this!!
19.2 Animal-like Protists KEY CONCEPT Animal-like protists are single-celled heterotrophs that can move.
19.2 Animal-like Protists Animal-like protists move in various ways. Animal-like protists are often called protozoa. macronucleus food vacuole oral groove micronucleus contractile vacuole cilia
19.2 Animal-like Protists Protozoa with flagella are zooflagellates. –flagella help zooflagellates swim –more than 2000 zooflagellates
19.2 Animal-like Protists Some protists move with pseudopods. – change shape as they move – amoebas
19.2 Animal-like Protists Forams Some protists move with pseudopods. – change shape as they move – amoebas and…
19.2 Animal-like Protists Some protozoa move with cilia. macronucleus food vacuole oral groove micronucleus contractile vacuole cilia – cilia help protists swim and capture food – more than 8000 ciliates
19.2 Animal-like Protists Some animal-like protists cause disease. Protists cause some well- known infectious diseases. sporozoites human liver liver cells developed parasites red blood cells Malaria is caused by Plasmodium and spread by mosquitoes. Sleeping sickness is caused by Trypanosoma and spread by flies. A giardia infection is caused by Giardia and spread through water. Malaria Infection
19.3 Plantlike Protists KEY CONCEPT Algae are plantlike protists.
19.3 Plantlike Protists Plantlike protists can be single-celled or multicellular. Photosynthetic plantlike protists are called algae. colony daughter colony Volvox
19.3 Plantlike Protists Protists (Diatoms) Do photosynthesis, but are protected by a silica (glass) shell
19.3 Plantlike Protists Euglenoids are a large group of plantlike protists. pellicle nucleus chloroplast eye spot contractile vacuole flagellum – mostly photosynthetic – some heterotrophic – single-celled – one or two flagella
19.3 Plantlike Protists Dinoflagellates are mostly marine plantlike protists. Dinoflagellates – have two flagella – may be bioluminescent – have stiff protective plates – can cause red tide
19.3 Plantlike Protists Multicellular algae are classified by their pigments. – Green algae contain chlorophyll a and b. – Brown algae contain chlorophyll c. – Red algae contain chlorophyll a and phycoerythrin. thickening agents used in ice cream like agar and carrageen come from Red Algae!
19.3 Plantlike Protists Many plantlike protists can reproduce both sexually and asexually. All algae can reproduce asexually. –Multicellular algae can fragment. –Chlamydomonas divides into zoospores.
19.3 Plantlike Protists Some algae produce sexually. – Some species alternate generations. – Sexual reproduction can be triggered by environmental stress.
19.4 Funguslike Protists Slime molds and water molds are funguslike protists. Slime molds have both funguslike and animallike traits. –decomposers, like fungi –can move, like animals
19.4 Funguslike Protists Slime molds can be plasmodial or cellular. – Plasmodial slime molds are giant cells with many nuclei. – Cellular slime molds contain independent cells. Watch ‘em move:
19.4 Funguslike Protists Water molds are freshwater, funguslike protists. – one type of water mold caused Great Potato Famine of Ireland in the 1800’s – made of branching strands of cells – can be parasites of plants or fish –If you see a dead-fish with filiments on it, that’s a watermold