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Kingdom- Protista (protists)

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Presentation on theme: "Kingdom- Protista (protists)"— Presentation transcript:

1 Kingdom- Protista (protists)
Common Characteristics of all protists: -cell type-eukaryote -unicellular and multicellular -microscopic -live in moist environment

2 Protists are grouped into categories based on the way they feed
1. protozoans-animal-like protists -feed by ingestion -all are unicellular 2. algae- plant-like protists -make own food by photosynthesis (autotroph) -unicellular and multicellular 3. slime molds and mildew- feed by decomposition

3 Major Roles of Protists
Algae (plant-like protist) is the base of the aquatic food chain Slime molds decompose and recycle nutrients Causes many diseases (ex. Malaria)

4 Protozoans (animal-like protists)
Includes 4 main groups: 1. Amoebas – have no definate shape -have extensions of the cytoplasm called pseudopodia (used to move and feed) -most live in saltwater and must constantly take in water to dilute the salt and pump excess out in vacuoles -most reproduce asexually (1 parent produces an offspring identical to parent)

5 2. flagellates- have flagella. -move by whipping the tail
2. flagellates- have flagella -move by whipping the tail -are beneficial and harmful 3.ciliates- have cila (short hair-like extensions) -live in aquatic areas (ex. Paramecium) sporozoans-produce spores -spores-reproductive cell that forms without fertilization and produces new offsprings -live inside a host such as the intestines or blood (these are the ones that cause disease like malaria) -all are parasites

6 Algae (plant-like protists)
-unicellular and multicellular phytoplankton (unicellular) -a major producer of nutrients and oxygen in the aquatic ecosystem -base of the aquatic food chain multicellular plant protists are much like a plant but lack roots, stems, leaves

7 6 algae phyla: 1. euglenoids-unicellular, aquatic
-feed like an animal and plant 2. diatoms-golden algae –unicellular -have shells that have the pigment carotenoid that gives it a gold color -store food as oil -organisms that eat these have a oily taste -as these die, their shells sink to the bottom and are mined and used as abrasives such as in toothpaste 3. dinoflagellates-several produce toxins and some are lethal -red tide –due to numerous dynoflagellates with reddish color (40-60 million/liter of water) -cannot harvest shellfish during red tide because their tissue may have the toxins in it

8 4. Red algae- marine seaweed -body area of these is called the thallus -have a pigment called phycobilins-green, blue, violet color 5. brown algae (kelp) -live on rocky coast of ocean floor -the chlorophyll in it is yellow brown called fucaxanthin -many have air bladders that help it to float -food habitat for marine organisms 6. green algae -has the major pigment chlorophyll -can reproduce by fragmentation (breaks off and each piece can grow a new organism)

9 -includes slime molds, water molds and downy mildews
Fungi-like protists -includes slime molds, water molds and downy mildews -the decompose like fungi but do not have all the characteristics of fungi

10 3 phyla of fungus-like protist:
1. slime molds 2. water molds 3. downy mildew

11 Slime molds: Exist in many colors Live in cool, moist, shady areas
Grow on organic matter like rotting leaves and stumps Reproduce similar to fungi (release spores)

12 Water molds: Liver in water or moist places
Most feed on dead organic matter Appear as fuzzy growths on decaying matter

13 Downy mildew: Causes many plant diseases because they are plant parasites


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