Lesson T1.3.1

T1.3.1 A healthy human diet Quiz: KS3 Biology, Unit 1

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

In partnership with Revision Ninja

Lesson T1.3.1, A healthy human diet: 20 multiple choice questions for the KS3 Biology (National Curriculum), Unit 1: Structure and function of living organisms, written with Revision Ninja.

Host it live on the board and students join with a game code on their own devices, or revise alone with Free Play. The answers are revealed in the game.

Host this setFree Play

The 20 questions

  1. Which nutrient is the main source of energy for the body?

    • Vitamins
    • Dietary fibre
    • Carbohydrates
    • Minerals

  2. Which nutrient is needed for the growth and repair of body tissues?

    • Calcium
    • Vitamin C
    • Protein
    • Dietary fibre

  3. Which mineral is needed to make haemoglobin in red blood cells?

    • Iodine
    • Calcium
    • Sodium
    • Iron

  4. Which mineral is needed for strong bones and teeth?

    • Potassium
    • Sodium
    • Iron
    • Calcium

  5. Why is dietary fibre important in a healthy diet?

    • It is the main building material of cells and tissues in the body
    • It is digested to release energy quickly into the blood for the body
    • It is stored as fat in the liver until the body needs more energy
    • It helps food move through the gut and prevents constipation

  6. Which nutrient is needed in only small amounts but is vital for health?

    • Protein
    • Vitamins
    • Lipids
    • Carbohydrates

  7. Which nutrient provides energy, insulates the body and is stored under the skin?

    • Dietary fibre, which adds bulk to food and helps it move through the gut
    • Vitamin D, which is made by the skin when it is exposed to sunlight
    • Lipids (fats and oils)
    • Calcium, which is needed for strong bones and healthy teeth in the body

  8. Why does the body need water in its diet?

    • It is needed for many chemical reactions and to keep the body hydrated
    • It is the main building material of muscles and is needed to grow new muscle tissue
    • It is digested into glucose, which cells then use in respiration each day
    • It is the main energy store in the body and is used up during long exercise

  9. Which food is a good source of vitamin C?

    • Butter
    • White rice
    • Milk
    • Oranges

  10. A diet contains lots of chips and sweets but no fruit or vegetables. Which nutrients is it most likely lacking?

    • Protein only, since chips and sweets contain no protein at all in them
    • Carbohydrate only, since chips and sweets contain no carbohydrate at all
    • Vitamins and dietary fibre
    • Energy, which the diet provides in large amounts from the chips and sweets

  11. Which food is the best source of protein?

    • Bread
    • Apples
    • Fish
    • Potatoes

  12. Which food is a good source of calcium?

    • Milk
    • Sugar
    • Vegetable oil
    • White rice

  13. Why does a healthy diet need several different food groups?

    • Protein is never needed in the diet, so it can be left out entirely
    • Each food group provides exactly the same nutrients as every other group
    • No single food provides all the nutrients the body needs
    • Only one food group provides energy, so the others are not needed at all

  14. A student's diet contains lots of starch but very little protein. Which body process is most likely to be affected?

    • Night vision, which depends on the amount of vitamin A in the diet
    • Growth and repair of tissues
    • Breathing rate, which rises and falls with the amount of oxygen used
    • Heart rhythm, which depends on the amount of salt in the diet each day

  15. Which statement correctly describes a balanced diet?

    • It contains only carbohydrates and fats needed for daily energy
    • It contains only vitamins and minerals needed to keep the body working
    • It contains the right amounts of all the nutrients and water
    • It excludes fibre to avoid digestive problems that can come from it

  16. Which vitamin does the body make when skin is exposed to sunlight?

    • Vitamin B
    • Vitamin C
    • Vitamin D
    • Vitamin A

  17. Why might someone choose a higher-fibre food from a label?

    • To get more energy from each gram of the food they are eating now
    • To reduce the need for water by eating the food with more fibre
    • To help the digestive system work well
    • To gain muscle directly from the food they are eating at the time

  18. Which mineral is needed for healthy nerve function and is found in table salt?

    • Sodium
    • Calcium
    • Iron
    • Magnesium

  19. Which combination of foods provides both energy and building materials for the body?

    • Vitamins and minerals only
    • Water and fibre
    • Pasta and chicken
    • Fibre and water only

  20. Why is it important to balance carbohydrates and fats in the diet?

    • Fats supply no energy at all, so they can be eaten in very large amounts
    • Neither nutrient affects health, so the balance of these two does not matter
    • Both supply energy, but too much of either can lead to weight gain
    • Carbohydrates prevent weight gain completely by using up all the energy

All KS3 Biology quizzes