Food Processing And Technology | Class 12 Home Science Notes
By ConceptScroll Team · Published on 17 July 2026 · 3 min read
Food Processing And Technology – this guide gives you a concise, exam-ready overview of Food Processing And Technology from Class 12 Home Science, written by ConceptScroll editors and reviewed against the latest NCERT textbook.
Importance of Food Processing and Preservation
Food processing and preservation are essential to transform raw, bulky, perishable, and sometimes inedible food materials into useful, concentrated, shelf-stable, and palatable foods or beverages. These processes improve storability, portability, palatability, and convenience, reducing preparation time and food wastage. Food deterioration occurs due to physical, chemical, and biological factors such as pest infestation, microbial contamination, enzymatic activity, exposure to oxygen, moisture, light, and temperature fluctuations. Microorganisms like bacteria, fungi, yeasts, and molds are primary agents of spoilage, thriving under favorable conditions of nutrient availability, moisture, pH, oxygen, and temperature. Enzymes naturally present in foods can also cause degradation post-harvest or slaughter. Traditional preservation methods include sun drying, fermentation, salting, pickling, candying, roasting, smoking, baking, and use of spices, many of which are still relevant today. Modern food processing integrates knowledge from food science, chemistry, microbiology, nutrition, sensory analysis, and good manufacturing practices to ensure food safety and quality. The main principles to prevent spoilage and extend shelf life include application of heat (e.g., pasteurization), removal of moisture (drying, dehydration), lowering storage temperature (refrigeration, freezing), reducing pH (acidification), and controlling oxygen availability (vacuum packaging). Understanding these principles allows food technologists to design processes that maintain nutritional value, sensory attributes, and safety of foods while meeting consumer demands.
📊 Diagram: Illustrations depict spoilage factors such as microbial growth and enzymatic activity, and preservation methods like drying and pasteurization.
🔗 Connection: This section connects to the classification of foods based on perishability and the specific processing methods suitable for each class.
Frequently asked questions
1. Explain the following terms: (A) Food Science (B) Food Processing (C) Food Technology (D) Food Manufacturing and (E) Food Spoilage
A) Food Science: It is the study of the physical, biological, and chemical makeup of food and the concepts underlying food processing and preservation.
B) Food Processing: It refers to the methods and techniques used to transform raw ingredients into food products that are safe, palatable, and have a longer shelf life.
C) Food Technology: It is the application of food science to the selection, preservation, processing, packaging, distribution, and use of safe food.
D) Food Manufacturing: It i
2. Explain briefly the significance of Food Technology. How has it affected the life of modern housewives, specially working women?
Food Technology is significant because it helps in preserving food, enhancing its nutritional value, ensuring food safety, and making food available throughout the year. It has introduced convenience foods, ready-to-eat meals, and packaged foods which save time and effort.
For modern housewives, especially working women, food technology has made meal preparation easier and faster, allowing them to balance work and home responsibilities better. It has reduced the need for daily cooking from scra
3. List some of the old methods of food preservation followed at home giving examples and their viability in present times.
Some old methods of food preservation include:
- Drying: Sun drying of grains, pulses, and fruits like mango slices. Still viable and widely used.
- Salting: Preserving fish and meat by applying salt. Used less now due to health concerns.
- Pickling: Using vinegar or salt to preserve vegetables and fruits. Still popular.
- Smoking: Used for fish and meat preservation. Less common now.
- Cooling: Using cellars or underground storage to keep food cool. Replaced by refrigeration.
Viability today d
4. Give a brief account of development of food preservation to its present status.
Food preservation has evolved from traditional methods like drying, salting, and pickling to advanced scientific techniques. The discovery of refrigeration and freezing revolutionized preservation by slowing microbial growth. Canning and vacuum packaging extended shelf life significantly. Modern methods include pasteurization, irradiation, use of preservatives, and modified atmosphere packaging. These developments ensure food safety, reduce spoilage, and maintain nutritional quality.
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