Science - Biology - Microorganismsagar280.png

Gap-Filling Quiz

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   Bacteria      cell      damp      decomposing      eye      Fungi      harmful      host      humans      infection      living      mould      parasites      penicillin      shapes      spores      survive      three      toxins      useful      Viruses   
Micro-organisms are organisms too small to be seen with the naked . They are found almost everywhere and can be both and beneficial to humans. Although extremely small, microbes come in many different and sizes. There are main groups of microbes:

are the smallest of the microbes and are generally harmful to . Viruses cannot by themselves. They require a ‘host’ cell in which to live and reproduce. Once inside the cell, they rapidly multiply destroying the in the process!

are multi-cellular organisms that can be both beneficial and harmful to humans. Fungi obtain their food by either dead organic matter or by living as on a host. Fungi range in size from being microscopic to very large and include , mushrooms and mildew. Harmful fungi are those which can cause an , or are poisonous to eat. Others can be beneficial or harmless e.g. Penicillium produces the antibiotic . They spread through the air in small hard seed-like . When these spores land on bread or fruit they open and grow under conditions.

are single celled organisms. During their normal growth, some produce which are extremely harmful to humans and cause disease. Some bacteria are completely harmless to humans whereas others are extremely to us.