Question

what is virus? for 3 marks​

Answer 1

Three types of malware: Viruses, worms and Trojans

Virus. A computer virus can automatically create and install a copy of itself on a computer's files, and – like a virus in humans – it can spread from computer to computer. ...Worm. Much like viruses, worms can automatically replicate and infect multiple files. ...Trojan.


a living thing, too small to be seen without a special instrument (microscope), that causes disease in people, animals and plants

(मनुष्‍यों, पशुओं और पौधों में) रोग उत्‍पन्‍न करने वाले सूक्ष्‍म (विषाक्त) जीवाणु, विषाणु, वाइरस

Answer 2

$\textbf{Virus}$:

They are submicrobes that have the characteristics of both living and non-living things.

For Example, TMV, FMDV etc.

$\textbf{Features}$:

1. They inhibit and reproduce only inside the cells of living organisms.

2. They obtain thier food from the host cells.

3. They are smaller that the smallest known cell.

4. They are visible by electron microscope only.

5. They are of various shape like- spherical, rod shaped, etc.