Lesson T1.3.3

T1.3.3 Diet imbalances and disease Quiz: KS3 Biology, Unit 1

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson T1.3.3, Diet imbalances and disease: 20 multiple choice questions for the KS3 Biology (National Curriculum), Unit 1: Structure and function of living organisms, written with Revision Ninja.

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The 20 questions

  1. Which condition develops over a long time when the body takes in more energy than it uses?

    • Starvation
    • Rickets
    • Obesity
    • Scurvy

  2. Why is a diet with too little protein harmful?

    • Bones become harder and more brittle over time in the body
    • Blood sugar rises too high after every meal and stays high
    • The stomach stops digesting food properly and food stays there
    • Growth and repair of tissues are impaired

  3. Rickets, which causes weak and bent bones in children, is linked to a lack of which nutrient?

    • Vitamin D
    • Vitamin C
    • Dietary fibre
    • Iron

  4. Anaemia is often caused by a lack of which mineral?

    • Calcium
    • Iodine
    • Sodium
    • Iron

  5. Which statement describes a deficiency disease?

    • A disease caused by eating too much fibre in the diet over time
    • A disease caused by bacteria living in the gut and harming digestion
    • A disease caused by too much energy stored in the body as fat
    • A disease caused by a lack of a nutrient the body needs

  6. A person who eats very little food over a long time loses weight and muscle. Which condition is this?

    • Anaemia, which is caused by too few red blood cells in the body
    • Starvation
    • Obesity, which is caused by storing extra energy as fat over time
    • Rickets, which is caused by a lack of vitamin D in the diet

  7. Which deficiency causes night blindness?

    • Calcium
    • Vitamin A
    • Vitamin D
    • Vitamin C

  8. What is a likely result of a lack of iron in the diet?

    • Weak bones and bent legs
    • Dry skin and cracking
    • Bleeding gums
    • Tiredness and pale skin

  9. Why does obesity increase the risk of heart disease?

    • Fat removes oxygen from the blood, so the heart has less oxygen to pump around
    • Obese people have fewer red blood cells, which lowers the oxygen supply to muscles
    • Fat makes the heart beat more slowly, which reduces the blood flow to the body
    • Excess fat can lead to blocked arteries and higher blood pressure

  10. A child's diet is low in calcium. Which health problem is most likely?

    • Weak bones and teeth
    • Night blindness, which is caused by a lack of vitamin A in the diet
    • Scurvy, which is caused by a lack of vitamin C in the diet
    • Anaemia, which is caused by a lack of iron in the blood

  11. Which two problems can result from an imbalanced diet?

    • Starvation and sunburn caused by too much time spent in the sun
    • Anaemia and cold sores, which are both caused by a lack of iron
    • Obesity and deficiency diseases
    • Scurvy and jaundice, which are both caused by a lack of vitamin C

  12. A diet lacking vitamin C is likely to cause which problem?

    • Bleeding gums and slow wound healing
    • Dark night vision, which is caused by too little vitamin A
    • Bent bones and rickets, which are caused by too little vitamin D
    • Weak red blood cells, which are caused by too little iron

  13. Why can a person develop a deficiency disease even when eating a lot of food?

    • Deficiency diseases only affect adults who eat large amounts of food
    • Food always contains every vitamin and mineral the body needs, in every single meal
    • Eating more food always supplies every nutrient the body needs each day
    • The food may lack the specific nutrient the body needs

  14. Why does starvation weaken the body's defences against infection?

    • Food blocks the white blood cells from reaching the sites of infection
    • Starvation increases the number of bacteria in the stomach, which causes infection
    • The body lacks the energy and protein needed to make new cells
    • The body makes too much vitamin C, which slowly weakens the immune system over time

  15. A teenager eats fast food every day and does no exercise. Which two problems are they most at risk of?

    • Scurvy and anaemia
    • Obesity and tooth decay
    • Starvation and rickets
    • Night blindness and rickets

  16. Which food would best help prevent rickets?

    • Oily fish, which contains vitamin D
    • Plain white bread, which has little vitamin D in it at all
    • Plain pasta, which provides carbohydrate but no vitamin D whatsoever
    • Sugary drinks, which contain sugar but no vitamin D at all

  17. Why are these illnesses called deficiency diseases?

    • The body has too much of a nutrient
    • The body makes too much energy
    • The body lacks a nutrient it needs
    • The body has too many bones

  18. A person eats only sweets and fizzy drinks for several years. Which problems are most likely?

    • Scurvy and starvation
    • Anaemia only
    • Obesity and dental decay
    • Rickets and night blindness

  19. Which describes an imbalance in the diet caused by too little fibre?

    • Constipation and digestive problems
    • Weakened bones, which are caused by too little calcium in the diet
    • Excess energy stored as fat, which is caused by too much energy
    • Pale skin and tiredness, which are caused by too little iron in the diet

  20. Which statement correctly explains why a balanced diet matters?

    • It supplies only energy and water, which is enough for healthy living
    • It removes the need for vitamins, because the body can make all of them itself
    • It replaces the need for exercise, since eating well keeps the body fit
    • It supplies enough energy and every nutrient in the right amounts

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