List certain common diseases of fishes.

Name two infectious diseases of fishes.

List the common reasons of indigestion.

List a few common diseases caused by viruses.

Give the reason for the following statements: Arthritis is a common disease of old age.

Give in a tabulated form some the common diseases affecting man and their mode of transmissi8on and methods of prevention.

Neutral system and computers share certain common features. Comment. (Hint : CPU, input-output devices).

Name three common fresh-water food fishes.