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Revision Notes

Preservation of Food

NIOS · Class 10 · Home Science

Quick revision notes for Preservation of Food — NIOS Class 10 Home Science. Key concepts, formulas, and definitions for last-minute revision.

45 questions34 flashcards5 concepts

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Key Topics to Revise

1

Food Spoilage and Shelf Life

  • Food spoilage means food is no longer fit for eating.
  • Spoilage is shown by colour change, bad smell, bubbles due to fermentation, mould growth, or soft brown spots on fruits and vegetables.
  • Mould on bread may be white, green, or black and is a sign of spoilage.
2

Principles and Methods of Food Preservation

  • The three principles of food preservation are: killing micro-organisms, preventing or delaying their action, and stopping enzyme action.
  • Food can be preserved at home by low temperature, high temperature, preservatives, and dehydration.
  • Lower temperature allows food to be preserved for a longer time.
3

Preservatives and Dehydration

  • A preservative is any substance added to food to make it last for a longer period.
  • Salt, sugar, lemon juice, vinegar, oil, and spices are natural preservatives.
  • Potassium metabisulphite, citric acid, and sodium benzoate are chemical preservatives.
4

Hygiene and Safe Handling of Stored Food

  • Hygiene is very important while preparing, storing, and using preserved food.
  • Utensils and containers used for cooking and storage should be cleaned and dried in the sun.
  • Containers should have air-tight lids.

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Full Notes

Key Concepts

Food is said to be spoiltMicroEnzymes are chemical substances foundShelf life is the timeFood preservation means preventing food from

Frequently Asked Questions

What are the important topics in Preservation of Food for NIOS Class 10 Home Science?
Key topics in Preservation of Food include Food Preservation Overview - Complete Concept Map, Mind map showing the different signs and types of food spoilage that students should recognize, Flowchart showing the three main causes of food spoilage and how they lead to the need for preservation methods. These are the concepts NIOS Class 10 examiners draw on most — study them first, then practise related questions.
How to score full marks in Preservation of Food — NIOS Class 10 Home Science?
Understand the core concepts first, then work through the 45 practice questions available for this chapter. Revise formulas and definitions regularly, and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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All 22 chapters — NIOS Class 10 Home Science Revision Notes

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