iStarSign inScience 5 · Unit 4: The digestive system · Cambridge Primary Science Stage 5
4.1 Parts and functions of the digestive system
16 questions · e.g. What does saliva do?
Questions
- so it can be stored in the mouth
- The body can only use food broken down into tiny particles.
- to make it taste better
- to make it heavier
2. Where does digestion start?
Check- absorbs water into the blood
- makes food solid
- makes food moist and starts to digest it
- pushes food out of the body
4. What is the tube that joins the mouth to the stomach?
Check5. How does the oesophagus move food?
- Gravity alone pulls it.
- It sucks it like a straw.
- Saliva carries it.
- Its muscles contract to squeeze food down.
6. What happens to food in the stomach?
- It is chewed by teeth.
- It is pushed out of the body.
- Water is absorbed from it.
- It mixes with digestive juices into a thick liquid.
7. Which organ breaks food down until the particles can move into the blood?
Check8. What does the large intestine do?
Check9. Through which opening do undigested food wastes leave the body?
Check10. How does digested food reach all parts of the body?
- It stays in the stomach.
- It travels down the oesophagus.
- It is carried in the blood.
- It moves through the bones.
11. Which test shows that a food contains starch?
Check12. Bread is chewed for three minutes, then tested with iodine. It hardly turns blue-black. Why?
- Bread never has starch.
- The bread got colder.
- Saliva has digested some of the starch.
- The iodine stopped working.
13. Why must you not taste iodine solution?
Check14. Class 5 put saliva in one beaker of rice and water in another. Why water?
- to cook the rice
- to make the rice grow
- because they ran out of saliva
- to compare, so they could see what the saliva did
15. Is a rabbit's digestive system similar to ours?
- Yes, it has many of the same parts.
- No, it has no intestines.
- No, rabbits digest in their ears.
- No, rabbits have no stomach.
16. In which animal does digestion probably take longer, a rabbit or a cat?
- they take exactly the same
- neither digests food
- a cat, because meat is harder
- a rabbit, because plants are harder to digest