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The Mystery of Food – Class 5 The World Around Us Chapter 3 Notes & NCERT PDF

Class 5The World Around UsChapter 3NCERT book: Our Wondrous World - EVS Class 5

Notes and a simple summary of Chapter 3 of the NCERT Class 5 The World Around Us book, with the official chapter PDF, flashcards, an MCQ quiz and an AI tutor for your doubts.

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Chapter 3: The Mystery of Food

Introduction

The Forgotten Tiffin Box! On a Monday morning, Disha finds the lunch box she forgot at school on Friday. Her favourite uttapam inside smells bad and has coloured patches. "What happened to my uttapam?" Now Detective Disha sets out to solve the mysteries of food, writing each Finding in her notebook. Her Anna (elder brother in Tamil) Aditya, who is in Grade 8, helps her. This is the first chapter of Unit 2: Health and Well-being.

What We Learn

Mystery #1: What made my uttapam spoil?

The patches are mould, a colony of thousands of microbes. Microbes are living things so tiny that we need a microscope to see them. They are found in soil, water, air, plants, animals and inside us. Some microbes spoil food, but others help us make curd and digest food.

Mystery #2: Why do some foods spoil faster?

Bread left on the balcony for two days got mouldy, but Paati's (grandmother's) mango pickle made two months ago was still good, because it was covered with oil.

Finding: Microbes need moisture, air and the right temperature to grow. Remove any one and they stop.

Mystery #3: How do we save food from spoiling?

Disha finds food preservation methods at home:

  • Drying and dehydration: Amma and Appa dry chillies in the sun to make chilli powder for the whole year. No moisture means no microbes. (Also papad, aam papad and dried fish.)
  • Pickling and oiling: Paati pours mustard oil over pickled mangoes. "Oil stops air from getting in."
  • Refrigeration and freezing: A fridge keeps food too cold for microbes to grow quickly.
  • Salt, sugar and spices like black pepper have been used for a long time. Vasco da Gama crossed oceans to get pepper from India!
  • Butter vs ghee: Butter needs the fridge, but ghee does not. Heating butter removes its water, and without water, microbes cannot grow.
  • Factories use air-tight cans and packets.
  • Clay matkas keep water cool without electricity.

    • Good microbes

  • Microbes in the air make idli batter rise (fermentation).
  • Curd and buttermilk have good microbes that help digestion when our stomach is upset.
  • Fermented rice (pakhala, kanji) cools the body.

    • My Food, My Pride

  • Seasonal fruits (like lychee in the rains) taste best in their season, and waiting makes eating them more fun. Local mangoes are fresh because they travel less.
  • Thatha (grandfather) carefully checks vegetables at the market.
  • India is the largest producer of millets and pulses, and one of the largest producers of bananas.

    • Chew Right!

  • We have four kinds of teeth: incisors to cut, canines to tear, premolars to crush and molars to grind.
  • Chewing properly breaks down food and releases saliva, which helps digestion.
  • Oral hygiene: Disha gets a cavity (a hole in a tooth). The dentist says to brush regularly, rinse after eating and eat fewer sweets.
  • Choking: Take small bites, chew well, and do not talk or laugh with food in your mouth.
    • Final discovery: Some microbes spoil food, while others help us make food and digest it. Eat right, preserve and store right, chew well, and thank the good microbes!

    Activities in the Chapter

  • List mango products that last long (pickle, aam papad, jam, squash).
  • Dry tomato slices in sunlight and observe them shrink and dry.
  • Ask elders about a family preservation practice.
  • Chewing activity: Notice which teeth cut and which grind.
  • Match item, method and product: roti → khakhra (dehydration), lemon → lemon pickle, butter → ghee, chillies → chilli powder, fish → dried fish.

    • Key Words

  • Microbes (सूक्ष्मजीव), Mould (फफूँद)
  • Microscope (सूक्ष्मदर्शी)
  • Spoilage (खराब होना), Preservation (परिरक्षण)
  • Dehydration (निर्जलीकरण), Pickling (अचार बनाना)
  • Refrigeration (प्रशीतन), Fermentation (किण्वन)
  • Saliva (लार), Cavity (दाँत में छेद)
  • Incisor (कृंतक), Molar (चर्वणक दाँत)

    • Connect to Your Life

    What does your family dry, pickle or store in the fridge? Which fruits come only in one season where you live?

    Common Mix-ups

  • Not all microbes are bad. Curd and idli need good microbes.
  • Oil in pickles is not just for taste. It keeps air out.
  • A fridge does not kill microbes. It slows them down.
  • Ghee lasts longer than butter because it has no water.

    • Let Us Reflect (Hints)

    For a two-day trip, carry dry or preserved foods (khakhra, dry fruits, laddoos) in air-tight boxes and keep them cool and dry.

    💡 Key Learning Points

    • ✓Food spoils because of microbes, tiny living things seen only with a microscope, and mould is a visible colony of them
    • ✓Microbes need moisture, air and the right temperature, so removing any one stops spoilage
    • ✓Traditional and modern preservation includes drying, pickling with oil, salt, sugar, spices, refrigeration, ghee-making and air-tight packing
    • ✓Good microbes help make curd and idli batter and help digestion
    • ✓Chewing properly with incisors, canines, premolars and molars, plus oral hygiene and small bites, keeps us healthy and safe from choking

    👨‍🏫 Teaching Tips

    • →Have each student keep a 'Food Detective' notebook and write Findings #1 to #13 as the class solves each mystery
    • →Leave a slice of bread in a closed moist box and a dry one open, and compare mould over a week (observe without touching)
    • →Dry tomato slices on the classroom window and weigh them before and after to show lost water
    • →Invite the school cook or an elder to show a local pickle or drying tradition
    • →Use a mirror and a snack to identify incisors, canines, premolars and molars while chewing
    • →Hold a seasonal fruit calendar activity for your region, for example amla in winter and jamun in summer
    • →Practise safe eating habits: small bites and no talking with food in the mouth, as the teacher's note advises

    📋 Assessment Questions

    1. Can the student explain what mould is and why the uttapam spoiled?
    2. Can the student name the three things microbes need to grow?
    3. Can the student match a food to its preservation method and product, such as chillies to chilli powder by drying?
    4. Can the student give two examples of good microbes helping us?
    5. Can the student name the four types of teeth and the job of each?

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    Keep learning

    All chapters in Our Wondrous World - EVS Class 5

    1. 1. Water — The Essence of Life
    2. 2. Journey of a River
    3. 3. The Mystery of Food
    4. 4. Our School — A Happy Place
    5. 5. Our Vibrant Country
    6. 6. Some Unique Places
    7. 7. Energy — How Things Work
    8. 8. Clothes — How Things are Made
    9. 9. Rhythms of Nature
    10. 10. Earth — Our Shared Home