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Topic ladders · Biology

Human Body & Nutrition

One topic, four rungs: from Classes 1–3 to Classes 11–12. Start at your own stage, or climb from the bottom. Every rung follows the same six steps: Notice, Guess, Try, Observe, Explain, Ask another question.

Print the family table: all four rungs side by side on one sheet, so everyone at home can find their own rung.

Choose your class stage

Rung 1 · Classes 1–3

Our Senses and Our Body

Before you start: safety and help

For the grown-up who helps.

  • Safety: Check for allergies before any tasting. Use only ordinary food you would serve at a meal, never cleaning products, medicines or unknown things. One clean spoon per child; do not share. Show the child how to waft a smell towards the nose instead of sniffing hard. If you use a blindfold, the child can take it off at any time.
  • Good questions: "Which sense told you that?"

What you need

  • Safe objects with different textures, sounds and colours (cloth, a bell, a leaf, a coloured book)
  • With a grown-up only: ordinary kitchen foods to smell and taste (a slice of lemon, a little jaggery, a pinch of salt, a mint leaf), one clean spoon per child

Child steps

  1. Notice. How do you know what is around you?
  2. Guess. Which part of your body helps you see, hear, smell, taste and feel?
  3. Try. Use each sense one at a time (eyes closed for touch, smell and hearing). Smell by waving the air towards your nose. Taste only what your grown-up gives you.
  4. Observe. What information did each sense give you?
  5. Explain. Tell someone which sense you used and what you found out.
  6. Ask another question. What happens if one sense is not working well? How do people manage?
For teachers
  • Learning aims: Identify the five senses and the body parts associated with them.
  • Key vocabulary: sight, hearing, smell, taste, touch, senses.
  • Step 6: talk respectfully about people who are blind or deaf and how they use other senses, Braille and sign language.
  • Review: Children name the five senses and one example for each.

Rung 2 · Classes 4–7

What Do Different Foods Give Us?

Before you start: safety and help

For the grown-up or teacher who helps. Students: read it too, so you know the rules.

  • Use local, familiar foods. Families eat differently by region, religion and choice; any of them can make a balanced plate.

What you need

  • Pictures or real examples of common foods (rice, roti, dal, milk, curd, egg, fruit, oil, vegetables, sweets)
  • Paper for sorting

Student steps

  1. Notice. We eat many different kinds of food. Why do we need them?
  2. Guess. Which foods give us energy? Which help us grow? Which keep us healthy?
  3. Try. Sort foods into groups: energy-giving, body-building, protective.
  4. Observe. Check whether some foods belong to more than one group (milk gives energy and helps us grow).
  5. Explain. Explain why a balanced meal needs foods from different groups, and water too.
  6. Ask another question. What happens if someone eats only one type of food for a long time?
For teachers
  • Learning aims: Classify foods by function; understand the idea of a balanced diet.
  • Key vocabulary: energy-giving (carbohydrates, fats), body-building (proteins), protective (vitamins, minerals), balanced diet, nutrients, fibre.
  • Care: Do not ask children to share or judge what is in their own tiffin, and never comment on body size. Sweets and fried foods give energy but are "a little, sometimes" foods.
  • Review: Students design a simple balanced plate and justify their choices.

Rung 3 · Classes 8–10

Digestion – The Journey of Food

Before you start: safety and help

For the grown-up or teacher who helps. Students: read it too, so you know the rules.

  • Help with accurate labelling from a reliable diagram. Only the student's own food for the chewing test.

What you need

  • Paper, pencil, coloured pens, a reliable labelled diagram (textbook)
  • Optional: a small piece of plain roti or bread; simple model materials (tube, bag, etc.)

Student steps

  1. Notice. Food goes into our mouth and waste comes out. What happens in between?
  2. Guess. Where is food broken down? What juices or organs help?
  3. Try. Draw the digestive system and label the main organs. Trace the path of food. Optional: chew a small piece of plain roti for about a minute without swallowing. Does the taste change?
  4. Observe. Research or recall what happens in the mouth, stomach, small intestine and large intestine.
  5. Explain. Describe the journey of food and the role of enzymes and organs in simple terms.
  6. Ask another question. What happens if one part of the digestive system is not working properly?
For teachers
  • Learning aims: Describe the human digestive system and the process of digestion.
  • Key vocabulary: digestion, enzyme, saliva, oesophagus, stomach, liver, pancreas, small intestine, large intestine, absorption, egestion.
  • Reference: mouth (chewing; saliva starts breaking starch into sugar, which is why the roti tastes slightly sweet); oesophagus (carries food); stomach (acid and enzymes start on proteins); small intestine (with bile from the liver and juices from the pancreas, finishes digestion and absorbs nutrients into the blood); large intestine (absorbs water); waste leaves through the anus.
  • Review: Students explain the path of food and one key process.

Rung 4 · Classes 11–12

Investigating a Physiological or Nutritional Question

Before you start: safety and help

For the grown-up or teacher who helps. Students: read it too, so you know the rules.

  • Safety and ethics: Gentle exercise only (for example stepping or a slow jog). No exercise trials for anyone with a heart or breathing condition, asthma, an injury, or who feels unwell today. Get consent from each participant (and a parent's consent if under 18); anyone can stop at any time; stop at once if someone feels dizzy, breathless or unwell. No diet changes, fasting, supplements or caffeine as experiments. Record data without names.

What you need

  • Depends on the investigation (pulse measurement, food labels, published nutrition tables, secondary data, etc.)

Student steps

  1. Notice. The human body maintains balance through many systems and responds to nutrition and activity.
  2. Guess / Hypothesise. Choose a focused, ethical question (e.g., effect of gentle exercise on heart rate, comparison of nutrient content in local foods using labels, recovery heart rate).
  3. Try. Design a safe, controlled investigation or careful data analysis.
  4. Observe. Collect or extract quantitative data and present it clearly.
  5. Explain. Analyse results in the context of human physiology or nutrition science. Discuss limitations and ethics.
  6. Ask another question. How do your findings relate to health recommendations or further research?
For teachers
  • Learning aims: Plan or analyse a biological investigation ethically; interpret data in a physiological or nutritional context.
  • Review: Students present question, method, data, conclusion and evaluation.

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