This question was attempted by many candidates and their performance was fair. In part (a)
candidate correctly define an air-borne disease. In part (b) candidates wrongly mentioned
diseases such as cholera, tuberculosis, measles, typhoid fever as disease - causing organisms.
In part (c) candidates could not correctly state ways by which diseases are generally controlled.
The expected answers were as follows:
5(a) Air-borne diseases
A disease caused by organisms that are carried in the air
through droplet infection/sneezing, coughing, talking and breathing/named
(b) Causative agent of diseases
(c) Ways by which diseases are generally controlled
sterilization of equipment
good personal hygiene/clean environment
use of drugs.