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Science Quiz - Digestion 02 (Questions)

The digestive system breaks food down into nutrients. In KS3 Science, pupils learn how this process fuels the body, supports growth, and helps repair tissues effectively.

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Fascinating Fact:

Food can take around 24–72 hours to travel through your whole digestive system.

In KS3 Science, the digestion topic explains how food moves through the mouth, stomach, and intestines, and how nutrients are absorbed to give the body the energy it needs.

Key Terms

Digestion: The process of breaking food into smaller, soluble molecules the body can use.
Stomach: An organ that churns food and mixes it with digestive juices, including acid and enzymes.
Intestines: Long tubes where most nutrient absorption into the bloodstream takes place.

Frequently Asked Questions (Click to see answers)

How long does digestion take in KS3 Science?

Digestion usually takes between 24 and 72 hours, depending on the type of food and the individual person’s digestive system.

What organs are part of the digestive system?

The digestive system includes the mouth, oesophagus, stomach, small intestine, large intestine, liver, and pancreas, all working together to process food.

Why is digestion important for the body?

Digestion is vital because it turns food into nutrients that provide energy, support growth, and repair body tissues so we stay healthy and active.

Try These Related Quizzes

1.

The small molecules are absorbed into the blood in the .......

[ ]	large intestine
[ ]	pancreas
[ ]	small intestine
[ ]	stomach

2.

The small intestine in an adult is .......

[ ]	1-2 metres long
[ ]	6-7 metres long
[ ]	10-11 metres long
[ ]	over 20 metres long

3.

The removal of undigested food is called .......

[ ]	absorption
[ ]	contraction
[ ]	egestion
[ ]	excretion

4.

Glucose is stored in the .......

[ ]	liver
[ ]	pancreas
[ ]	small intestine
[ ]	stomach

5.

Fats are stored .......

[ ]	in the large intestine
[ ]	in the pancreas
[ ]	in the stomach
[ ]	under the skin

6.

Which of the following is a function of the pancreas?

[ ]	Absorbs digested food into the blood
[ ]	Absorbs water from the gut
[ ]	Makes bile to break down fats
[ ]	Makes enzymes

7.

What does the large intestine do?

[ ]	Absorbs digested food into the blood
[ ]	Absorbs water from the gut
[ ]	Makes bile to break down fats
[ ]	Makes enzymes

8.

Which of the following is a job carried out by the liver?

[ ]	Absorbs water from the gut
[ ]	Makes bile
[ ]	Makes amylase
[ ]	Stores fats and glycerol

9.

The small intestine has special structures, called villi, which help absorption of digested food. Which of the following is NOT a feature?

[ ]	Good blood supply
[ ]	Impermeable walls
[ ]	Large surface area
[ ]	Thin layer of cells

10.

Iodine solution is a yellow-brown colour and is used to test for starch. If starch is present what colour does the iodine turn?

[ ]	blue-black
[ ]	milky
[ ]	orange-red
[ ]	purple

You can find more about this topic by visiting BBC Bitesize - Nutrition, digestion and excretion

Science Quiz - Digestion 02 (Answers)

1.

The small molecules are absorbed into the blood in the .......

[ ]	large intestine
[ ]	pancreas
[x]	small intestine
[ ]	stomach

They are small enough to pass through the wall of the small intestine

2.

The small intestine in an adult is .......

[ ]	1-2 metres long
[x]	6-7 metres long
[ ]	10-11 metres long
[ ]	over 20 metres long

It needs to be as long as that to give the enzymes time to break down the food as it slowly passes through the body

3.

The removal of undigested food is called .......

[ ]	absorption
[ ]	contraction
[x]	egestion
[ ]	excretion

The opposite is ingestion which is the scientific word used for taking something into the digestive system

4.

Glucose is stored in the .......

[x]	liver
[ ]	pancreas
[ ]	small intestine
[ ]	stomach

It is released when needed

5.

Fats are stored .......

[ ]	in the large intestine
[ ]	in the pancreas
[ ]	in the stomach
[x]	under the skin

The body has special cells to store fat

6.

Which of the following is a function of the pancreas?

[ ]	Absorbs digested food into the blood
[ ]	Absorbs water from the gut
[ ]	Makes bile to break down fats
[x]	Makes enzymes

Its other main function is to produce the hormones that regulate the level of sugar in your blood

7.

What does the large intestine do?

[ ]	Absorbs digested food into the blood
[x]	Absorbs water from the gut
[ ]	Makes bile to break down fats
[ ]	Makes enzymes

This changes the undigested part of your food from a sloppy liquid into a soft solid

8.

Which of the following is a job carried out by the liver?

[ ]	Absorbs water from the gut
[x]	Makes bile
[ ]	Makes amylase
[ ]	Stores fats and glycerol

It has been estimated that the liver has about 500 different jobs to do in your body

9.

The small intestine has special structures, called villi, which help absorption of digested food. Which of the following is NOT a feature?

[ ]	Good blood supply
[x]	Impermeable walls
[ ]	Large surface area
[ ]	Thin layer of cells

The walls are permeable to allow absorption to occur

10.

Iodine solution is a yellow-brown colour and is used to test for starch. If starch is present what colour does the iodine turn?

[x]	blue-black
[ ]	milky
[ ]	orange-red
[ ]	purple

You may have carried out an experiment using iodine, starch and amylase to investigate digestion