Why and how food is preserved, the three basic principles and each method (drying, heat, pasteurisation, freezing, refrigeration, salting, sugaring, smoking, chemicals, irradiation), and where post-harvest losses occur.
Deshapriya Senevirathne. B.Sc. (Hons) Biology Special, University of Peradeniya — graduated with a class pass. All the content and lessons in A/L Biology on Paadama are reviewed by Deshapriya Senevirathne, and the lessons are taught by him.