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In General Usually unicellular Reproduction: Some asexual, some sexual, some both Kingdom for life that doesnt fit in animals, plant or fungi kingdom.

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Presentation on theme: "In General Usually unicellular Reproduction: Some asexual, some sexual, some both Kingdom for life that doesnt fit in animals, plant or fungi kingdom."— Presentation transcript:

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3 In General Usually unicellular Reproduction: Some asexual, some sexual, some both Kingdom for life that doesnt fit in animals, plant or fungi kingdom Mostly aquatic life 3 main categories

4 AKA: Protozoans Basic Features: – Aquatic, unicellular – Heterotrophic: pathogens, parasites, predators Classified by how they move: 1) Pseudopods : move w/ pseudopodia (false- feet) – Engulf by phagocytosis – Ex: Amoebas 2) Flagellates: move w/ flagella – Ex: Zooflagellates 3) Ciliates: move w/ cilia – Ex: Paramecia Animal-Like Protista

5 Amoeba (Pseudopod)

6 Flagellate Moving

7 Ciliate Moving

8 Animal-Like Protista & Disease Malaria – Caused by: Plasmodium Vector: Mosquitoes – Effects in humans: Fatigue, fever, vomiting, coma, death Sleeping sickness – Caused by: Trypanosoma Vector: Tsetse flies – Effects in humans: Coma & death

9 Plant-like Protista AKA: Algae Most unicellular; No leaves, stems, roots Perform photosynthesis with chloroplasts Classified by their type of cell wall 1) Euglenoids: use flagella to swim – Animal & plant-like 2) Dinoflagellates – Most (~ 90%) plankton – Basis of aquatic food chains 3) Diatoms – Glasslike shells – Provide ~ ½ the O 2 on earth Red algae Green algae Brown algae

10 Euglena

11 Fungus-like Protista Basic Features: – Decomposers: Absorb and recycle nutrients – Live in moist environments 2 major groups: 1) Slime Molds – large (~1 meter) single celled mass of cytoplasm – Fungus-like (absorbs food) – Animal-like (can move) 2) Water molds: Can be parasitic – Ex: Potato blight: caused Irish potato famine (1840s)

12 Cool Slime Mold Video

13 Origins of Multicellularity Protista live in 3 arrangements… 1) Single-celled – Live by themselves 2) Colonial – Group of independent acting cells – No specialized cells 3) Multicellular – Cells specialized to be specific jobs Importance: Cells in colonies became efficient at certain tasks. Cells & their offspring became specialized and dependent on each other. = ANCESTORS OF MULTICELLULAR LIFE Unicellular EuglenaThis is a colony of cells called Volvox Multicellular Kelp

14 And lastly (if you couldnt tell already) … Protists are difficult to classify Protista is one kingdom in the domain Eukarya. –Some protists are not closely related. –Molecular evidence supports reclassification. –Protista classification will likely change.

15 REview 1) Name the three categories of protista. 2) Which category of protista has members that are able to move? 3) Which category of protista has members that absorb nutrients? 4) Which category of protista has members that are heterotrophs? 5) Which category of protista has members that hunt? 6) How does a pseudopod, flagella, and cilia differ? 7) Name the 3 major categories of protozoa. 8) Name the 3 major categories of algae. 9) Name the 2 major categories of fungus-like protista.


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