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Protozoans Animal-like Protists.

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Presentation on theme: "Protozoans Animal-like Protists."— Presentation transcript:

1 Protozoans Animal-like Protists

2 Protozoans Includes forams and radiolarians
Found on surface and in bottom sediments Unicellular Animal like Kingdom Protista Subdivided into 3 phyla: Ciliophora Zoomastigina Sarcodina

3 Ciliophora Largest group
Most free swimming, some attached to substrate Move by beating microscopic cilia Fresh and salt water

4 Sarcodina Forams, radiolarians, and amoebas
Live on surface of substrates Move and eat using pseudopods “amoeboid movement”

5 Zoomastigina Animal like protists Move using a flagella
Live in freshwater, saltwater, and as parasites within other organisms

6 Life Functions of Protozoans
All life functions carried out within 1 cell! Ingestion – getting food in Digestion – breaking food down Respiration – food to energy (ATP) Transport – gas exchange Water balance/excretion Sensitivity – responding to stimuli reproduction

7 Vorticella Ciliophora Unicellular Ciliated protozoan
Sessile – attached to substrate

8 Ingestion and Digestion
Vorticella Food is swept toward “mouth” oral groove by moving its ring of cilia Food particles enter food vacuoles, where they are broken down. Intracellular digestion – inside a cell

9 Respiration Converting food (sugars) into energy (ATP) using oxygen
Occurs in the mitochondria Oxygen + Glucose -> Water + Carbon Dioxide +36 ATP Vorticella uses ATP to contract its stalk

10 Transport Oxygen and Carbon Dioxide diffuse across the cell membrane
Oxygen diffuses IN Carbon Dioxide diffuses OUT Inside the cell food vacuoles move around and distribute nutrients

11 Water Balance and Secretion
Water moves into aquatic organisms like Vorticella through osmosis Eventually they would burst, but… Excess water is pumped out through the Contractile Vacuole Excretory Vacuole – pumps out liquid waste Helps maintain homeostasis (a stable internal environment)

12 Sensitivity Ability of an organism to respond to environmental stimuli
Vorticella Responds to touch by contracting its stalk into a coil Avoidance reaction to stimuli that may be harmful Also contracts spontaneously

13 Reproduction Asexual reproduction
Binary fission – division of prokaryotic cell into 2 identical cells

14 Sexual reproduction Conjugation
2 parent protozoans exchange parts of their micronuclei when they come in contact (exchange genetic material) Increases genetic variation Binary fission then occurs, but with unique offspring.

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