List the four most common symptoms of a food-borne disease.

1. List five ways by which diseases are transmitted through food indirectly.

2.  Which of the following foods are at a high risk of sewage contamination? Give reasons for your answer.

(a) roasted cashewnuts

(b) mint chutney

(c) apple pie

(d) green salad

(e) river fish

3.  List the four most common symptoms of a food-borne disease.