SG Exam Hub

Primary 3 · Science · Systems: Digestive

Systems: Digestive questions for Primary 3 Science

9 questions to work through online, 2 of them written out the way the paper asks. Answer and you get the working straight away, then a score at the end. No sign-up, and you can retake it as often as you like.

  • Order of the parts
  • What happens where
  • What the mouth does
  • Where food is absorbed
  • Why food must be digested
  • The large intestine
  • Reading a lettered diagram
  • Naming a part
  • Naming the liquid in the mouth
0 of 9 answered
Question 1 of 9Order of the parts
The path food takesmouthWgulletXstomachYsmall intestineZlarge intestine
The parts of the digestive system in the order food passes through them.
According to the diagram above, where does food go immediately after leaving the mouth?
Question 2 of 9What happens where

Same picture as the question above.

In the diagram above, at which part is food first broken into smaller pieces by the teeth?
Question 3 of 9What the mouth does
What happens to food in the mouth?
A
It is broken into smaller pieces by the teeth.
B
It is mixed with saliva.
C
Digested food passes into the blood there.
Question 4 of 9Where food is absorbed
The path food takesmouthWgulletXstomachYsmall intestineZlarge intestine
The parts of the digestive system in the order food passes through them.
At which part shown in the diagram does digested food pass into the blood?
Question 5 of 9Why food must be digested
Why does food have to be digested before the body can use it?
Question 6 of 9The large intestine
The path food takesmouthWgulletXstomachYsmall intestineZlarge intestine
The parts of the digestive system in the order food passes through them.
According to the diagram, what happens in the last part, after the small intestine?
Question 7 of 9Reading a lettered diagram

Same picture as the question above.

Using the diagram above, which statements are correct?
A
Food reaches Y before it reaches Z.
B
Food at Z has been broken down more than food at W.
C
Digestion begins at X.
D
Food passes through X on the way from W to Y.
Question 8 of 9Naming a part

Same picture as the question above.

Look at the part labelled Y in the diagram above.What is the name of this part?
Question 9 of 9Naming the liquid in the mouth
As food is chewed, the mouth adds a liquid that makes it easier to swallow and starts digesting it.What is that liquid called?
Answers and explanations for all 9 questions

Every answer with the reasoning behind it. Worth reading after you have tried the set — or on its own, if you are a parent marking it.

  1. According to the diagram above, where does food go immediately after leaving the mouth?

    Answer: X

    After the mouth, food is swallowed into the gullet, which is X in the diagram.

  2. In the diagram above, at which part is food first broken into smaller pieces by the teeth?

    Answer: W

    W is the mouth, where the teeth break food into smaller pieces.

  3. What happens to food in the mouth?

    Answer: A and B only

    The mouth does two things: the teeth break food up and saliva mixes with it. Food only passes into the blood much later, in the small intestine.

  4. At which part shown in the diagram does digested food pass into the blood?

    Answer: Z

    Z is the small intestine. Digested food passes through its wall into the blood there.

  5. Why does food have to be digested before the body can use it?

    Answer: because it must be broken down small enough to pass into the blood

    The body can only use food once it has been broken down small enough to pass into the blood, which is what digestion does.

  6. According to the diagram, what happens in the last part, after the small intestine?

    Answer: Water is taken out of what is left, and the rest leaves the body.

    By the large intestine the useful food has already been absorbed. Water is taken out of what is left and the rest leaves the body.

  7. Using the diagram above, which statements are correct?

    Answer: A, B and D only

    Food goes W, X, Y, Z in order, so it reaches Y before Z and passes through X on the way. Food at the mouth is barely digested, so by Z it has been broken down far more. Digestion begins in the mouth, not the gullet.

  8. Look at the part labelled Y in the diagram above. What is the name of this part?

    Answer: stomach

    Y is the stomach, where food is churned and digested further.

  9. As food is chewed, the mouth adds a liquid that makes it easier to swallow and starts digesting it. What is that liquid called?

    Answer: saliva

    The liquid the mouth adds to food is saliva.