kingdom:protista the unicellular eukaryotes. protista eukaryotic usually unicellular (one group of...
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Kingdom:ProtistaThe Unicellular Eukaryotes
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Protista
• Eukaryotic • Usually unicellular (One group of multicellular
protista – the red, green and brown algae)• It is not a fungus, plant or animal• Video – The Protists - Biology
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The Groups of Unicellular ProtistsGroup Animal-like
Protists (Protozoans)
Fungus-like Protists Plant-like Protists
Examples Amoebas, Ciliates, flagellates
Slime Moulds, water moulds
Eugleniods, diatoms and dinoflagellates
Distinguishing characteristics
•They consume other organisms for food.•Some species are parasites.•Heterotrophs
•They absorb nutrients from other organisms, living or dead.•Some consume other organisms, some are parasites.•Saprotrophs (heterotrophs)
•They can make their own food using photosynthesis.•Some consume other organisms when light is unavailable.•Some live as symbionts with other organisms.•Autotrophs (Heterotrophs)
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Animal-like ProtozoaVideo – Flagella and Ciliated Protozoa
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Animal –like Protists• Ciliates – these are covered in Cilia (short hair-
like projections that coordinate together to assist with cell movement)
• Some are free-moving ex. Paramecium and some are parasites (Balantidium coli – lives in the human gut and causes diarrhea).
• Flagellates – have 1 or more Flagella (long whip like projection that propels the cell)
• Some live in a mutualistic relationship with their host (Trichonympha – lives in the gut of termite and digests cellulose)
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Fungus-like Protist – Slime mouldVideo – John Bonner’s Slime Mould
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Fungus –like Protists
• Special Heterotrophs – they absorb nutrients from living or dead organisms and from waste. (saprotrophs)
• Three groups:– Plasmodial slime – tiny slug like organism that creep over
damp decaying plant matter.– Cellular slime – individual cells that feed by eating
bacteria. – Water mould – filimentous organisms that live on dead
organic matter, or as a parasite on fish, insects and water plants.
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Plant –like Protists - DiatomsVideo – Plant Protists Biology
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Plant-like Protists
• Can carry out photosynthesis.• Most have chlorophyll – have a green colour.• Three groups:– Diatoms – (Phytoplankton) single celled- free
floating aquatic organisms. Food for larger marine organisms.
– Dinoflagellates – (Phytoplankton) single celled, has 2 flagella, can create red tide. (deadly toxic poison)
– Euglenoids – Shallow fresh water, autotrophs in sunlight and heterotrophs in the dark.