Question

Why do viruses need to invade a host cell?

Short answer

Viruses need to invade a host cell because viruses don't have the capability to reproduce, so they replicate themselves inside the host cell.

Step-by-step solution

Given Information

We have to find out the reasons of the need for a host cell for viruses.

Explanation

Viruses don't have the capacity to reproduce themselves because they are just single or double stranded DNA protected inside their coat called a capsid. So, in order to reproduce themselves, they need a host so that they can infect the host cell, and then the host cell will work for them by replicating viruses and creating thousands of viruses.