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Food Quality and Food Safety – Class 12 Home Science Chapter 5 Notes & NCERT PDF

Class 12Home ScienceChapter 5NCERT book: Human Ecology and Family Sciences Part I - Home Science Class 12

Notes and a simple summary of Chapter 5 of the NCERT Class 12 Home Science book, with the official chapter PDF, flashcards, an MCQ quiz and an AI tutor for your doubts.

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Chapter 5: Food Quality and Food Safety

Introduction

Food is a major determinant of health, nutritional status and productivity of a population, so the food we eat must be wholesome and safe. This chapter of Unit II (Nutrition, Food Science and Technology) explains why food safety and quality have become a worldwide concern. The book gives a striking statistic: according to the National Family Health Survey 2015-16, more than 9 lakh Indian children under five suffered from acute diarrhoea. Food-borne illness can cause death. It can also damage trade, tourism and earnings.

Key Concepts

Significance: why concern has grown. The book lists several reasons:

  • Lifestyles are changing and more people eat outside the home. Food made in bulk is handled by many persons and often prepared hours in advance, so it is more easily contaminated.
  • More processed and packaged foods are sold, and even spices, condiments and spice mixes that were once processed at home are now bought pre-packaged.
  • Bulk food moves through complex transport chains, with a long gap between processing and consumption.
  • Microbial adaptation, antibiotic resistance, altered human susceptibility and international travel have increased food-borne microbial disease. Nearly half of all known food-borne pathogens were discovered in the past 25-30 years.
  • India signed the WTO non-tariff agreement, so its food must meet standards for trade, and imported food must be checked too.
  • Pollution of air, soil and water, pesticide use, and additives such as preservatives, colourants, flavouring agents and stabilisers make food analysis essential.

    • Food safety means assurance that food is acceptable for human consumption according to its intended use. Two related terms explain it:

  • Toxicity is the capacity of a substance to produce harm or injury of any kind under any conditions.
  • Hazard is the relative probability that harm or injury will result when a substance is not used in a prescribed manner and quantity.

    • Hazards are of three kinds:

  • Physical hazards are materials not normally found in food, such as hair, stones, matchsticks, nails and jewellery (Fig. 6.1).
  • Chemical hazards are deleterious substances added intentionally or unintentionally. Examples are pesticide and veterinary residues, cleaning chemicals, toxic metals, adulterants and excess additives (Fig. 6.2).
  • Biological hazards are living organisms. Some are visible, such as worms, flies, weevils, cockroaches and caterpillars (Fig. 6.3). Others are invisible microbes: bacteria, viruses, yeasts, moulds and protozoa (Fig. 6.4). Micro-organisms that cause disease through food are called food-borne pathogens.

    • Microbial food-borne disease takes two forms:

  • Food intoxication is caused by toxins that remain in food even after the pathogen is killed. Toxins cannot be detected by smell, appearance or taste. Staphylococcus aureus, carried in the nose, throat, skin and hair of about 50 per cent of healthy people, is the example given.
  • Food infection comes from eating live pathogens that multiply in the body. Salmonella is the classic example. It lives in the intestinal tract of animals and in raw milk and eggs, and it doubles every 20 minutes. It spreads through inadequate cooking and cross-contamination, for example when a chopping board used for raw meat is used for salad without cleaning. Symptoms are diarrhoea, fever and abdominal cramps.

    • Parasites such as tapeworm in pork also cause infestation. New pathogens emerge through host changes, mutation, climate, mass production and globalisation.

    Other key terms

  • Contamination is the presence of harmful or objectionable foreign substances (chemicals, micro-organisms, diluents) before, during or after processing or storage.
  • Adulteration lowers food quality by adding inferior material or extracting a valuable ingredient. It includes biological and chemical contamination during growth, storage, processing, transport and distribution.
  • Adulterants are substances that make food unsafe for human consumption.
  • Food quality refers to the attributes that influence a product's value to consumers. Negative attributes include spoilage and contamination; positive ones include colour, flavour and texture. Safety is a preliminary attribute and a precursor of quality.

    • Food service providers must attend to five salient points: quality of raw materials and water, cleanliness, storage at appropriate temperature, food hygiene, and good service practices.

    Food standards exist at four levels:

  • Company standards, which are usually copies of national standards.
  • National standards, issued by the Food Safety and Standards Authority of India (FSSAI).
  • Regional standards.
  • International standards, set by ISO and the Codex Alimentarius Commission (CAC).

    • Standards in India

  • The ISI mark of BIS and Agmark are voluntary certification schemes.
  • The Prevention of Food Adulteration Act, 1954 was amended over 200 times. It sat alongside the Fruit and Vegetable Product Order, the Meat Food Products Order and the Vegetable Oil Products Order.
  • The Food Safety and Standards Act (FSSA), 2006 brought all of these under one umbrella. It shifted food law from compositional (vertical) standards to safety (horizontal) standards.
  • The Act set up FSSAI to frame regulations, accredit laboratories, advise governments, collect risk data, train food businesses and promote awareness.

    • International bodies

  • CAC is an intergovernmental body. The Codex is a collection of internationally adopted standards, codes of practice and guidelines, and countries use it to develop national regulations.
  • ISO is a non-governmental federation of national standards bodies. ISO 9000 deals with quality management and is voluntary. The book's comparison box contrasts Codex (used to develop national regulations, slow to change, describes minimal acceptable practices) with ISO (voluntary, reviewed every five years, describes current standard industrial practices).
  • WTO was established in 1995 to help trade flow smoothly, freely, fairly and predictably.

    • An effective food control system needs two things: food inspection and analytical capability.

    Food safety management systems

  • GMP (Good Manufacturing Practices) is proactive quality assurance that prevents contamination and false labelling.
  • GHP (Good Handling Practices) is a farm-to-consumer approach that ensures everyone who handles food follows good hygiene.
  • HACCP (Hazard Analysis Critical Control Point) examines raw materials and every processing step for hazards and defines controls. It is preventive; end-product testing, by contrast, is slow and costly and finds problems only after they occur. HACCP uses resources cost-effectively, and FSSA 2006 places primary responsibility on producers through HACCP, GMP and GHP.

    • Activities & Case Examples

  • Activity 1: Store 5 fruits, 5 vegetables and a chapati at room temperature for a week, and chart changes in appearance, texture, colour and odour on day 2 or 3 and day 7.
  • Activity 2: Observe hygiene at a dhaba or canteen and make an ICT pamphlet for workers.
  • Practical 1: Groups inspect raw foods, snacks and mithai from different vendors using a worksheet of physical hazards.
  • Practical 2 covers qualitative adulteration tests:

    • - sesame oil in ghee: 1 per cent sucrose and concentrated HCl give a pink colour

    - stalks in tea: should be below 25 per cent

    - light berries in black pepper: they float in an alcohol-water mixture

    - metanil yellow in turmeric: concentrated HCl gives a pink to magenta colour

    - starch in milk or ice cream: iodine gives a blue colour

    - colophony resin in asafoetida: copper acetate gives a blue or green colour in the ether layer

    Career Paths

    The food industry accounts for about 26 per cent of GDP. Useful knowledge areas are food chemistry, food processing and preservation, food analysis and quality control, food microbiology, food laws and sensory evaluation. The career avenues listed are:

  • quality control laboratories, as analysts or managers
  • food testing laboratories, including food inspector posts
  • specialist in HACCP
  • food auditor
  • quality certification such as ISO
  • teaching and academics
  • research
  • scientific writing
  • work in voluntary organisations

    • Fig. 6.6 adds HACCP auditor, HACCP trainer and R&D roles. For entrepreneurship, one could set up an analytical laboratory, a food safety consultancy, or food safety and sanitation education.

    Board Exam Focus

    The review questions ask you to:

  • Explain why food safety and quality are of global concern.
  • Explain the terms hazard, toxicity, contamination, food quality and adulteration.
  • Say what Codex Alimentarius is.
  • Discuss the significance of HACCP.
  • List national and international food standards.

    • Practise adulteration tests with the exact reagent and colour change for each.

    Key Terms

  • Food safety (khadya suraksha)
  • Food quality (khadya gunvatta)
  • Hazard (khatra)
  • Toxicity (vishaktata)
  • Contamination (sandooshan)
  • Adulteration (milavat)
  • Adulterant (milavati padarth)
  • Food-borne illness (khadya-janit rog)
  • Food poisoning (khadya vishakta)
  • Pathogen (rogjanak)
  • Cross-contamination (paraspar sandooshan)
  • Food standards (khadya manak)
  • Food Safety and Standards Act (khadya suraksha evam manak adhiniyam)
  • HACCP (khatra vishleshan mahatvapurna niyantran bindu)
  • Codex Alimentarius (khadya samhita)

    • Common Mistakes

  • Treating toxicity and hazard as the same thing. Toxicity is a substance's inherent capacity to harm; hazard is the probability of harm when it is misused.
  • Assuming that food which looks and smells fine is safe. Staphylococcal toxins cannot be detected by the senses.
  • Calling ISO standards mandatory. ISO 9000 is voluntary, and so are the ISI mark and Agmark.

    • 💡 Key Learning Points

    • ✓Food safety means assurance that food is acceptable for human consumption according to its intended use. Toxicity is a substance's capacity to harm; hazard is the probability of harm when it is not used in the prescribed manner and quantity.
    • ✓Hazards are physical (hair, stones, nails), chemical (pesticide residues, adulterants, excess additives) or biological (visible pests, and invisible microbes such as bacteria, viruses, yeasts, moulds and protozoa).
    • ✓Food intoxication is caused by toxins that survive even after the organism dies (Staphylococcus aureus). Food infection is caused by live pathogens multiplying in the body (Salmonella, which doubles every 20 minutes and spreads by cross-contamination).
    • ✓Food standards work at company, national (FSSAI), regional and international (ISO, Codex) levels. The FSSA 2006 consolidated the PFA 1954 and older Orders and shifted food law from vertical (compositional) to horizontal (safety) standards.
    • ✓GMP, GHP and HACCP are food safety management systems. HACCP is preventive and checks every step, so it is more efficient than end-product testing; it supports careers in quality control, auditing, inspection, research and consultancy.

    👨‍🏫 Teaching Tips

    • →Open with the NFHS 2015-16 figure (more than 9 lakh under-five children with acute diarrhoea) and ask students to name the last time they or their family had a stomach upset after eating out.
    • →Sort a bag of pictures or real items (a hair, a stone, an empty pesticide bottle label, a photo of a weevil) into physical, chemical and biological hazards to fix the three categories.
    • →Draw a kitchen timeline to show how a raw-chicken chopping board used for salad spreads Salmonella, and contrast this with Staphylococcal toxin that survives reheating.
    • →Build a four-step ladder on the board (Company, National, Regional, International) and write FSSAI, BIS/Agmark, ISO and Codex at the correct rungs.
    • →Run Activity 1 as a week-long class observation chart so that quality changes (bright to dull, firm to soggy, mould) are seen, not just read.
    • →Demonstrate one safe adulteration test (iodine for starch in milk) and let groups predict the result before adding the reagent.
    • →Let students map a local dhaba or canteen's process into HACCP steps and mark where a critical control point would sit.
    • →Close with a career web from Fig. 6.6 and ask each student to pick one role and state which subject knowledge it needs.

    📋 Assessment Questions

    1. Define and distinguish toxicity, hazard, contamination, adulteration and food quality with one example each.
    2. Explain the difference between food intoxication and food infection using Staphylococcus aureus and Salmonella.
    3. List the four levels of food standards and describe the main functions of FSSAI under FSSA 2006.
    4. Compare Codex and ISO, and explain why HACCP is preferred over end-product inspection.
    5. Describe the procedure, observation and interpretation of any two qualitative tests for food adulteration.

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    Keep learning

    All chapters in Human Ecology and Family Sciences Part I - Home Science Class 12

    1. 1. Work, Livelihood and Career
    2. 2. Clinical Nutrition and Dietetics
    3. 3. Public Nutrition and Health
    4. 4. Food Processing and Technology
    5. 5. Food Quality and Food Safety
    6. 6. Early Childhood Care and Education
    7. 7. Management of Support Services, Institutions and Programmes for Children, Youth and Elderly