Question

why are viruses not considered as cellular organisms. Name some other such organisms.

Answer 1

Viruses are not truly ‘living’ as they are living only inside the host body, else inert because they don't have any cellular machinery of their own. When they are present inside the body of a host, they take over the host cell machinery to replicate themselves, killing the host. That's why they are not considered as cellular organisms. Except viruses there are no other such organisms.