kingdom protoctista. includes protozoa and algae some are microscopic, but some can be observed by...
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Kingdom Kingdom ProtoctistaProtoctista
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Kingdom ProtoctistaKingdom Protoctista
• Includes Protozoa and Algae• Some are microscopic, but some can be observed by
the unaided eye• Some are unicellular organisms, but some are
multicellular (i.e. made up of many cells) with a simple body structure
• They DO have a nucleus and organelles• They are very abundant, free living in water or damp
environment, or as parasites in other organisms
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ProtozoaProtozoa(Singular: Protozoan)(Singular: Protozoan)
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ProtozoaProtozoa
• “Animal-like” protoctist
• Found in wide range of habitats such as fresh water, sea water, soil and inside bodies of plants and animals, where moisture is available
• Usually unicellular
• Larger in size than bacteria
• Do not have cell wall
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ProtozoaProtozoa
• Lack chlorophyll – why is this significant?
Cannot carry out photosynthesis!
• Feed on smaller organisms and small food particles
• Motile – some of them possess flagella (singular: flagellum) or cilia (singular: cilium)
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Flagella
Cilia
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ProtozoaProtozoa
Examples of Protozoa:• Amoeba
• Paramecium
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AmoebaAmoeba
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AmoebaAmoeba
Acanthamoeba are free-living amoeba commonly found in tap water. It can cause damages to the cornea. Always use sterile solution to clean contact lenses!
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ParameciumParamecium
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AlgaeAlgae(Singular: Alga)(Singular: Alga)
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AlgaeAlgae
• “Plant-like” protoctist
• Found in sea water and fresh water
• Can be either unicellular or simple multicellular
• Each cell is surrounded by a cell wall
• Possess chloroplasts which contain chlorophyll and other photosynthetic pigments for making their own food by photosynthesis
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Some different types of algae
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AlgaeAlgae
Examples of Algae:• Spirogyra
• Seaweeds
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SpirogyraSpirogyra
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SeaweedsSeaweeds
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EuglenaEuglena
Euglena is a protoctist that shows a mixture of features of protozoa and algae. It contains chlorophyll and carries out photosynthesis, but it also feeds on smaller organisms. It has a flagellum and is able to move about in water.
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ChallengeChallenge
What is the main difference between
prokaryotes and protoctists?
The presence of a distinct nucleus in protoctists!!!