EVERYDAY SCIENCE

Detailed explanation-1: -Viruses cannot reproduce outside a living cell because they lack the cellular organisation and independent machinery which is required for the reproduction and other metabolic activities. They can only multiply inside the living cell of host by using host’s cellular machinery.

Detailed explanation-2: -For viruses to multiply, they usually need support of the cells they infect. Only in their host´s nucleus can they find the machines, proteins, and building blocks with which they can copy their genetic material before infecting other cells.

Detailed explanation-3: -Viruses reproduce inside a living organism. They can develop only inside the cells of the host organisms (which may be an animal, plant or bacterium).