What is virus

 Q.1 What are Viruses? Describe the properties (characteristics) of virus

Ans. Viruses are very minute organisms, visible under electron microscope. This word virus is derived from a latin word venome, means Posion. In 1892 a Russian virologist Ivanowsky indicate the existence of virus in Tobacco mosaic disease. 

Properties of Virus:

(1) Viruses are non-cellular parasitic organisms,