Question

Traditional and modern techniques of fruit preservation

Answer 1

The activity of micro-organisms and enzymes is halted when food is frozen allowing food and nutrients to be preserved for long periods of time. In the case of refrigeration microbial and enzymatic activity is considerably reduced in temperatures below 5 degrees centigrade, which is why refrigeration is such an effective means of food preservation. Whilst some cultures sought out caves to preserve food and aristocrats built cool houses the vast body of everyday cooks had access to neither. Refrigeration is an excellent modern invention and an ideal way to keep raw food fresh.
CANNING
Freezing
Drying
Pickling
Sugar concentrates. Etc

Answer 2

traditional techniques:
1)by common salt
2)by sugar
3)by oil and vinegar
4)by keeping tulsi and neem leaves above them packed in a container

modern techniques:
1)by chemical preservatives
2)by anti-oxidation
3)by nitrogen gas
4)by vaccum