Virus in Micro Organism


 
 
Concept Explanation
 

Virus in Micro Organism

They are so small that they cannot be seen using ordinary light microscopes and are usually studied with the help of powerful microscopes called electron microscopes. Viruses are hard to classify as living or non-living as, on their own, they show no signs of life.

  • Viruses are always parasitic and therefore, cause diseases in their host. Many human diseases like influenza, common cold, measles, mumps, chicken pox, rabies etc. are caused by viruses.
  • One of the most fatal disease caused by an HIV (Human Immunodeficiency Virus ) virus is AIDS(Acquired Immune Deficiency Syndrome). It spreads through sexual contact with an infected person.
  • Tobacco Mosaic Virus (TMV) : This virus infect  the cells of a tobacco plant. In cattle, FMDV (Foot and Mouth Disease Virus) causes foot and mouth  disease. Polio virus causes poliomyelitis (polio). 
  • However, they reproduce inside the cells of organisms like plants, animals, or bacteria. Tobacco Mosaic Virus (TMV) and Human Immunodeficiency Virus (HIV) are examples of viruses. The widely feared avian flu and swine flu are also caused by viruses.
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    Sample Questions
    (More Questions for each concept available in Login)
    Question : 1

    Choose the correct definition for "Virus"

    Right Option : A
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    Explanation
    Question : 2

    Viruses are _____________________ organisms.

    Right Option : A
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    Explanation
    Question : 3

    Which of the following microorganisms cannot multiply on their own?

    Right Option : D
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    Explanation
     
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