Human Digestive System

27 Grade 4 Integrated Science questions on Human Digestive System, with worked marking schemes. 27 questions are available on this topic in full.

1. Question 1

   4 marks

   Arrange the following parts of the digestive system in the correct order that food passes through them: stomach, mouth, large intestine, food pipe, small intestine.

   (4 marks)

   Marking scheme

   Correct order: mouth, food pipe, stomach, small intestine, large intestine. Award 4 marks for fully correct order (deduct for each misplaced part).

2. Question 2

   1 mark

   Undigested food leaves the body through the

   A. Mouth

   B. Nose

   C. Anus

   D. Food pipe

   (1 mark)

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3. Question 3

   1 mark

   Digestion of food begins in the

   A. stomach

   B. mouth

   C. large intestine

   D. small intestine

   (1 mark)

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4. Question 4

   1 mark

   The bag-shaped organ where food is stored, churned and mixed after being swallowed is the

   A. Tongue

   B. Stomach

   C. Windpipe

   D. Small intestine

   (1 mark)

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5. Question 5

   1 mark

   In which part of the digestive system is food first chewed and mixed with saliva?

   A. Small intestine

   B. Food pipe

   C. Mouth

   D. Stomach

   (1 mark)

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6. Question 6

   1 mark

   Too many sugary foods can cause

   A. good eyesight

   B. strong bones

   C. strong muscles

   D. tooth decay

   (1 mark)

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7. Question 7

   1 mark

   The small intestine absorbs

   A. sound from the ears

   B. digested food into the blood

   C. water from the skin

   D. air into the lungs

   (1 mark)

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8. Question 8

   1 mark

   Which of these is a good way of caring for the digestive system?

   A. Eating very fast

   B. Drinking dirty water

   C. Skipping meals every day

   D. Chewing food well before swallowing

   (1 mark)

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9. Question 9

   1 mark

   When we have teeth problems, we should visit a

   A. farmer

   B. dentist

   C. driver

   D. teacher

   (1 mark)

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10. Question 10

    1 mark

    Which teeth are used for tearing food?

    A. Incisors

    B. Premolars

    C. Molars

    D. Canines

    (1 mark)

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11. Question 11

    3 marks

    Wanjiku swallowed a large piece of meat without chewing it well and felt discomfort.

    (a) Explain why chewing food well is important.

    (b) Name the liquid in the mouth that helps to soften food.

    (3 marks)

    Marking scheme

    (a) Chewing breaks food into small pieces that are easy to swallow and quicker to digest (2 marks). (b) Saliva (1 mark).

12. Question 12

    1 mark

    Which type of food helps food to move smoothly through the gut and prevents constipation?

    A. Fruits and vegetables

    B. Sweets

    C. Soda

    D. Fried chips

    (1 mark)

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13. Question 13

    3 marks

    (a) Name the part of the digestive system where digested food is absorbed into the body.

    (b) State two things a pupil can do to keep the digestive system healthy.

    (3 marks)

    Marking scheme

    (a) Small intestine (1 mark). (b) Any two (1 mark each): chew food well; wash hands before eating; drink clean water; eat fruits and vegetables; avoid overeating.

14. Question 14

    1 mark

    Juma always washes his hands before eating. The main reason for doing this is to

    A. Make the food taste sweet

    B. Remove germs so they do not enter the body with food

    C. Make the hands smell nice

    D. Warm the hands before a meal

    (1 mark)

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15. Question 15

    1 mark

    To keep teeth healthy, we should

    A. brush them at least twice a day

    B. avoid drinking water

    C. brush them once a month

    D. eat sweets every day

    (1 mark)

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16. Question 16

    4 marks

    Explain two reasons why eating fruits and vegetables is good for the digestive system.

    (4 marks)

    Marking scheme

    Any two reasons explained (2 marks each): they provide fibre/roughage that helps food move through the gut and prevents constipation; they help digestion work smoothly; they provide water and vitamins that keep the digestive organs healthy.

17. Question 17

    1 mark

    Food is mixed with digestive juices in the

    A. mouth

    B. liver

    C. stomach

    D. throat

    (1 mark)

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18. Question 18

    3 marks

    (a) Name two parts of the digestive system found in the head region.

    (b) State one function of the teeth in digestion.

    (3 marks)

    Marking scheme

    (a) Any two of: mouth, teeth, tongue (1 mark each = 2 marks). (b) Teeth chew/break food into small pieces so it is easy to swallow and digest (1 mark).

19. Question 19

    1 mark

    The tube that carries swallowed food from the mouth down to the stomach is the

    A. Large intestine

    B. Food pipe

    C. Windpipe

    D. Small intestine

    (1 mark)

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20. Question 20

    1 mark

    The teeth used for cutting food are called

    A. premolars

    B. incisors

    C. canines

    D. molars

    (1 mark)

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21. Question 21

    1 mark

    The watery liquid produced in the mouth that helps to soften food is called

    A. Saliva

    B. Sweat

    C. Bile

    D. Mucus

    (1 mark)

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22. Question 22

    3 marks

    (a) State the function of the stomach in digestion.

    (b) Give one reason why we should drink enough clean water each day.

    (3 marks)

    Marking scheme

    (a) The stomach stores food and churns/mixes it, breaking it down further into a soft mixture (2 marks). (b) Water helps in digestion / softens food / prevents constipation / helps waste move out (1 mark).

23. Question 23

    1 mark

    In which part of the digestive system is water taken back into the body and waste (faeces) formed?

    A. Stomach

    B. Mouth

    C. Small intestine

    D. Large intestine

    (1 mark)

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24. Question 24

    3 marks

    State three ways of taking care of the human digestive system.

    (3 marks)

    Marking scheme

    Any three (1 mark each): chew food well before swallowing; wash hands before eating; eat fruits and vegetables; drink enough clean water; avoid overeating; eat a balanced diet; avoid eating dirty food.

25. Question 25

    1 mark

    Which shows the correct path food follows after it is swallowed?

    A. Food pipe, mouth, stomach

    B. Stomach, mouth, food pipe

    C. Mouth, food pipe, stomach

    D. Mouth, stomach, food pipe

    (1 mark)

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26. Question 26

    1 mark

    Digested food is mainly absorbed into the body through the walls of the

    A. Large intestine

    B. Stomach

    C. Food pipe

    D. Small intestine

    (1 mark)

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27. Question 27

    1 mark

    Amina chews a piece of ugali into small pieces before swallowing. Which part of the body does most of this chewing?

    A. The saliva

    B. The lips

    C. The tongue

    D. The teeth

    (1 mark)

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