Answer:
The chemical substances which are used to check or stop the growth of harmful micro-organisms in food are called food preservatives. These food preservatives keep the edible food materials protected from the invasion of micro-organisms which can spoil the food. Some common food preservatives are: (i) Salt: Common salt is used to preserve meat, fish, ambia, raw mangoes, tamarind, etc. (ii) Sugar: Jams, jellies and squashes are preserved by sugar. Sugar reduces the moisture content which inhibits the growth of bacteria that can spoil food. (iii) Oil: Edible oils are used as preservatives in vegetables and pickles. Oil does not allow the moisture to surface, thus preventing the growth of harmful bacteria. (iv) Vinegar: It is used to preserve fruits, vegetables, fish, meat and pickles.
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