Which one of the following is a pesticide?

1. benzoic acid
2. aldrin
3. sugar
4. gun powder

Mortar is used as:

1. a plastic material
2. a building material
3. an insecticide
4. a medicine

The chemicals prescribed by a doctor in treatment of infectious diseases are called:

1. antigens
2. preservatives
3. antibiotics
4. fertilisers

(a) …………… deals with the study of matter and the changes it undergoes.

(b) …………… help to increase the production of food.

(c) Food items like jams and pickles are protected by using ……………

(d) L.P.G. is used for ……………

(e) Inert gases were discovered by ……………