What is virus ? define it
Answers
Answer:
A virus is an infectious agent of small size and simple composition that can multiply only in living cells of animals, plants, or bacteria.
Answer:
viruses are the smallest micro organisms. They do not have a cellular structure like other micro-organisms.
They are so small that they cannot be seen by a light microscope. To observe viruses scientist use an electron microscope which magnifies an object to more than 2,00,000 times. Viruses cannot reproduce by themselves respond to changes aur use energy or grow. This seems to indicate that viruses are not living organisms . However, when a virus enters the living cell of an organism se are human it is able to reproducereproduce. It uses the energy of the host cells for this purpose. After the formation of thousands of viruses the host cell often dies .