Q. 84.1( 58 Votes )

Give a brief account

Answer :

  • Viruses are non cellular, obligate parasites. This means that viruses needs a host to survive; they cannot survive on their own.
  • Viruses have an outer protein covering known as capsid and their own genetic material which can be RNA or DNA.
  • They never contain both DNA and RNA.
  • Their genetic material is what causes viral infections.
  • Viruses can have different shapes such as helical, icosahedral, complex etc.

Examples of viral diseases:

  • Viruses cause diseases like mumps, small pox, herpes and influenza.
  • AIDS in humans is also caused by a virus.
  • In plants, discoloration and mottling (formation og irregular patterns) is caused by the TMV (Tumor Mosaic Virus)

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