People have always used natural chemicals in their daily lives. Vegetable dyes are used to colour wool and cloth or to make paint. Other chemicals from plants have been used as medicines. Originally, drugs such as penicillin were made from moulds grown naturally. Today, most of our medicines are artificially produced.
Scientists have produced chemicals to help farmers. Fertilizers, spread on the fields, make crops plentiful and strong. Pesticides can be used to kill insects that damage crops. Although chemicals are used to improve our lives, many may be harmful too. For this reason, chemicals are developed and tested in laboratories before they are used.
Pesticides are sprayed on crops to protect them from being eaten by insects.
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