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Micro-Organisms Types
   
Microbes scum by nojhan on Flickr

  • Micro-organisms are tiny living things. 
  • They are present in the air, in water and in our bodies. 
  • They need food, water & warm conditions to grow.  
  • Some micro-organisms are harmful and cause disease & others make food go bad.  
  • However, not all micro-organisms are harmful. Many are used in the brewing, baking and dairy industries. 
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Bacteria by kaibara87 on Flickr

Four different types of micro-organisms are:-

  • Bacteria are single celled organisms.  

  • They are able to live in body tissues between cells.  

  • They need food, warmth and moisture to grow.  

  • They can multiply quickly by cell division if conditions are right.  

  • Bacteria cause diseases such as whooping cough, tuberculosis, pneumonia and cholera.  

  • Salmonella is a bacteria that can cause food poisoning.

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Fungi @ Dunwich Heath by timparkinson on Flickr

  • Fungi are the largest of the four types of micro-organism.  
  • The fungus makes fine threads, which invade cells and absorb nutrients from them.  
  • Fungi can live on decaying substances or in living tissue.  
  • They include moulds, which live on rotting food. 
  • The diseases caused by fungi include athlete's foot, ringworm and thrush.

 

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influenza virus by kat m research on Flickr

  • Viruses are the smallest micro-organisms.  
  • They can only be seen using the most powerful microscopes.  
  • Viruses invade and then destroy living cells.  
  • Viruses are responsible for many diseases such as : influenza, measles, chickenpox and smallpox.
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Acanthamoeba cyst in brain tissueby prep4md on Flickr

  • Protozoa are single celled organisms like amoeba.  
  • They are larger than viruses and bacteria.  
  • Protozoa feed by absorbing nutrients from their surroundings.  
  • Malaria and amoebic dysentery are caused by protozoa.
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