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Food Preservation

Telangana Open School (TOSS) · Class 12 · Community Science (Home Science)

Step-by-step guide to study Food Preservation in Telangana Open School (TOSS) Class 12 Community Science (Home Science). Topics to cover, practice strategy, and time allocation.

45 questions30 flashcards4 concepts

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Study Plan

1
Day 1–2

Learn the Theory

Read the textbook chapter carefully. Note down definitions, formulas, and key concepts.

2
Day 3

Practice Problems

Solve textbook exercises and additional practice questions. There are 45 questions available for this chapter.

3
Day 4

Revise & Test

Revise key formulas and concepts without looking at notes. Take a practice quiz to test your understanding. Mark weak areas for re-revision.

4
Day 7

Spaced Revision

Revisit Food Preservation after a week. Use flashcards for quick recall. Solve previous year questions from this chapter.

What to Focus On

  • Pasteurization uses mild heat; sterilization uses intense heat.
  • HTST: 71.5°C for 15 seconds; UHT: 135°C for 1–2 seconds.
  • Blanching inactivates enzymes but causes nutrient loss.

  • Salt and sugar draw out water from microbes by osmosis.
  • Vinegar lowers pH, preventing microbial growth.
  • Synthetic preservatives are used in small, regulated amounts.

  • Fermentation uses microbes to produce acids or alcohol.
  • Lactic acid fermentation occurs in anaerobic conditions.
  • Acetic acid fermentation requires oxygen.

Common Mistakes to Avoid

Pasteurization kills all bacteria in milk, making it completely sterile.

Freezing food kills all bacteria, so frozen food is completely safe forever.

Adding salt or sugar preserves food only by making it taste bad for bacteria.

Memory Tips

Three main categories of food preservation: Physical, Chemical, Biological

Physical methods: Pasteurization, Sterilization, Refrigeration, Freezing, Canning, Drying

Pasteurization: HTST (71.5°C for 15 sec) and UHT (135°C for 1–2 sec)

Sterilization destroys more microbes than pasteurization and uses higher heat

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Frequently Asked Questions

What are the important topics in Food Preservation for Telangana Open School (TOSS) Class 12 Community Science (Home Science)?
Food Preservation covers several key topics that are frequently asked in Telangana Open School (TOSS) Class 12 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Food Preservation — Telangana Open School (TOSS) Class 12 Community Science (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.

More resources for Food Preservation

All 42 chapters — Telangana Open School (TOSS) Class 12 Community Science (Home Science) Study Plan

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