Unicellular Organisms

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Unicellular Organisms
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Most living organisms are composed of millions of
cells. They are multicellular.
Some living organisms are unicellular which means
that they only consist of one cell.
This means that this single cell will be able to
show all the characteristics of a living organism.
Examples of unicellular organisms which show
animal characteristics include
1. amoeba
2. paramecium
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Amoeba
Cell Membrane
Nucleus
Contractile Vacuole
Pseudopod
Pseudopodia
Food being engulfed
Food vacuole
Cytoplasm
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amoeba
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Cilia
Food Vacuoles
Oral Groove
Cell Mouth
Micronucleus
Macronucleus
Contractile Vacuole
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Some unicellular organisms show plant like
features. Eg pleurococcus
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Euglena show plant and animal features.
Cell membrane
Food store / reserve
Nucleus
Light detector
Contractile Vacuole
Eyespot
Second Flagellum
Chloroplast
Flagellum
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Euglena has chloroplasts which is typical of a
plant.
Typical animal features include flagellum (for
movement), lack of cell wall. The eyespot and
light detector work together to detect direction
and intensity of light.
What to do
1. Collect textbook . Copy diagrams and tables of
pleurococcus and paramecium. from textbook page
1. Copy diagram of euglena page 5 and make up a
similar table for this organism.
2. If available view pondwater under microscope.
Add a drop of glycerine to slow organisms down.
3. View bioviewers of unicellular organisms.