1Discuss the traditional and modern methods of preservation of food materials.
2Prepare a list of other chemicals used in daily life and sort them as chemicals used as food, as food preservatives, for cleaning and as pesticides.
3What are food preservatives? Why does food decay?
4Differentiate between first-class and second-class preservatives with two examples of each.
5Why does a pickle mixed with salt and oil stay good while a plain one rots?
6What are ripening agents? Name three. Why must fruit ripened with calcium carbide be treated with care?
7How do traditional methods such as wrapping fruit in a jute sack or burying it in hay make fruit ripen faster?
8What precautions should be taken while using chemical preservatives and ripening chemicals?