Kingdom protista
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Kingdom protista

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    Kingdom protista Kingdom protista Presentation Transcript

    • Kingdom Protista
    • General Characteristics Protists are very diverse and have few traits in common Most are single-celled organisms, but some are many cells, and others live in colonies Some produce own food, others eat other organisms or decaying matter Some can control own movement, others cannot
    •  Characteristics that protists DO share:  Eukaryotic(have a nucleus), but are less complex than other eukaryotic organisms  Do not have specialized tissues Members of the kingdom Protista are related more by how they differ from members of other kingdoms than by how they are similar to other protists
    • zooflagellates  Protists have many different shapesPretzel slime  Most scientists mold ulva agree that fungi, plants, and animals evolved from early protists Paramecium
    • Protists and Food Protists can get food many ways:  Can make own food  Can eat other organisms  Can eat parts or products of other organisms  Can eat remains of other organisms  Some use more than one way to get food  Some produce food—they use chloroplasts to produce food through photosynthesis
    •  Finding Food Heterotroph: organism that cannot make own food Some are decomposers—they get energy by breaking down dead organic matter
    • Asexual Reproduction Most protists reproduce asexually Offspring come from just one parent Binary fission: a single-celled protist divides into two cells Each new cell is a single-celled protist
    • Sexual Reproduction Requires two parents Paramecium sometimes reproduce sexually by a process called conjugation
    •  Algae Kinds of Protists  Allalgae have the green pigment chlorophyll, which is used to make food through photosynthesis  Almost all algae live in water  Free-floating, single- celled algae are called phytoplankton, which produce much of the world’s oxygen
    •  Amoebas  Soft,jellylike protozoans  Found in fresh and salt water, soil, and in parasites  Move with pseudopodia, which means “false feet”
    •  Ciliates  Have hundreds of cilia— tiny, hairlike structures  Cilia move the protist forward by beating back and forth—sometimes up to 60 times a second!  Cilia are also used for feeding—they move the food towards the protist’s food passageway  Best known of ciliates is the Paramecium
    •  Spore-Forming Protists  Many spore-forming protists are parasites  They absorb nutrients from their hosts  No cilia or flagella, cannot move on their own  Have complicated life cycles that usually includes two or more hosts  Example: protist that causes malaria uses both mosquitoes and humans as hosts
    •  Slime Molds  Heterotrophic and can only move during certain periods of life cycle  Look like thin, colorful globs of slime  Use pseudopodia to move and eat fungi and yeast  When environmental conditions are stressful, slime molds grow stalks with knobs, which contain spores
    •  Red Algae  Most of world’s seaweed is red algae  Most live in tropical oceans  Usually less than 1 m in length  Contain chlorophyll, but have red pigment  Red pigment allows them to absorb light that filters deep into ocean
    •  Brown algae  Most seaweed in cool climates are brown algae  Attach to rocks or form large floating beds in ocean waters  Have chlorophyll and yellow-brown pigment  Many are very large—up to 60 meters
    •  Green algae  Most diverse of protist producers  Green because chlorophyll is main pigment  Most live in water or moist soil  Others live in melting snow, on tree trunks, and inside other organisms
    •  Diatoms  Single-celled  Found in salt and fresh water  Get energy from photosynthesis  Make up a large percentage of phytoplankton  Cell walls contain a glasslike substance called silica