Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download 19.1 Diversity of Protists
Document related concepts
no text concepts found
Transcript
19.1 Diversity of Protists KEY CONCEPT Kingdom Protista is the most diverse of all the kingdoms. TEKS 8B, 8C 19.1 Diversity of Protists TEKS 8B, 8C ! Protists can be animal-like, plantlike, or funguslike. • Protists are eukaryotes that are not animals, plants, or fungi. 19.1 Diversity of Protists • Animal-like protists consume other organisms. – heterotrophs – single-celled TEKS 8B, 8C 19.1 Diversity of Protists TEKS 8B, 8C ! Animal-like protists move in various ways. • Animal-like protists are often called protozoa. macronucleus contractile vacuole food vacuole oral groove micronucleus cilia 19.1 Diversity of Protists • Protozoa with flagella are zooflagellates. – flagella help zooflagellates swim – more than 2000 zooflagellates TEKS 8B, 8C 19.1 Diversity of Protists • Some protists move with pseudopods. – change shape as they move – amoebas TEKS 8B, 8C 19.1 Diversity of Protists • Some protists move with pseudopods. – change shape as they move – amoebas – foraminifera TEKS 8B, 8C 19.1 Diversity of Protists TEKS 8B, 8C • Some protozoa move with cilia. – cilia help protists swim and capture food – more than 8000 ciliates macronucleus contractile vacuole food vacuole oral groove micronucleus cilia 19.1 Diversity of Protists TEKS 8B, 8C ! Some animal-like protists cause disease. • Protists cause some wellknown infectious diseases. • 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. human liver sporozoites liver cells developed parasites red blood cells Malaria Infection 19.1 Diversity of Protists • Plantlike protists are photosynthetic. – single-celled, colonial, or multicellular – no roots, stems, or leaves TEKS 8B, 8C 19.1 Diversity of Protists TEKS 8B, 8C ! Plantlike protists can be single-celled or multicellular. • Photosynthetic plantlike protists are called algae. colony daughter colony 19.1 Diversity of Protists TEKS 8B, 8C • Euglenoids are a large group of plantlike protists. – mostly photosynthetic – some heterotrophic – single-celled – one or two flagellapellicle nucleus contractile vacuole flagellum chloroplast eye spot 19.1 Diversity of Protists • Dinoflagellates are mostly marine plantlike protists. – have two flagella – may be bioluminescent – have stiff protective plates – can cause red tide Dinoflagellates TEKS 8B, 8C 19.1 Diversity of Protists • Diatoms are plantlike protists with glasslike shells. – shells made of silica – produce large amounts of oxygen TEKS 8B, 8C 19.1 Diversity of 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. TEKS 8B, 8C 19.1 Diversity of Protists • Funguslike protists decompose dead organisms. – heterotrophs – can move, whereas fungi cannot TEKS 8B, 8C 19.1 Diversity of Protists ! Protists are difficult to classify. • Protista is one kingdom in the domain Eukarya. TEKS 8B, 8C 19.1 Diversity of Protists • Protist classification will likely change. – Some protists are not closely related. – Molecular evidence supports reclassification. TEKS 8B, 8C
Related documents