Explain the following terms with one example in each case : (3 maks)
(i) Food preservatives (ii) Enzymes (iii) Detergents
(i) Food Preservatives : They are used to prevent spoilage of food due to microbial growth.
Example : Table salt, vegetable oils, sodium benzoate etc.
(ii) Enzymes : The enzymes may be defined as bio-catalysts which catalyse the bio-chemical
reactions in the living organisms.
Example : Pepsin and Amylase.
(iii) Detergents : They may be defined as ammonium, sulphonate or sulphate salts of long chain
hydrocarbons containing 12-18 carbon atoms.
Example : Sodium lauryl sulphate.
Unlike soaps they are non-biodegradable and hence cause water pollution but they can be
conveniently used even in hard water.