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Unicellular Organisms

Unicellular Organisms. 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.

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Unicellular Organisms

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  1. Unicellular Organisms

  2. 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

  3. Amoeba Cell Membrane Nucleus Contractile Vacuole Pseudopod Pseudopodia Food being engulfed Food vacuole Cytoplasm

  4. amoeba

  5. Cilia Food Vacuoles Oral Groove Cell Mouth Micronucleus Macronucleus Contractile Vacuole

  6. Some unicellular organisms show plant like features. Eg pleurococcus

  7. Euglena show plant and animal features. Cell membrane Food store / reserve Nucleus Light detector Contractile Vacuole Eyespot Second Flagellum Chloroplast Flagellum

  8. 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.

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