The smart way to improve grades

Comprehensive & curriculum aligned

Affordable pricing from £10/month

The Digestive Enzymes

In this worksheet, students will work on the different enzymes involved in the digestive process and test their understanding of where they come from and what they do.

'The Digestive Enzymes' worksheet

Key stage:  KS 3

Curriculum topic:  Biology: Structure and Function of Living Organisms

Curriculum subtopic:  Nutrition and Digestion

Difficulty level:  

Worksheet Overview

QUESTION 1 of 10

Family baking

 

It's supper time and the smell of freshly baked cookies starts to fill the house. Amazingly, this is all it takes for your body to begin the digestive process. As the smell of food reaches your nose, your mouth will start to salivate in anticipation of eating and digesting the food, and here is why:

 

Digestion is the process of breaking down food into small soluble molecules that our bodies can absorb. There are several organs involved in the digestive system; however, we could not digest our foods if it wasn't for the presence of special chemicals called enzymes.  Each enzyme is produced in the pancreas, with its own job to do and a specific food type to help break down.  

 

Carbohydrates

If you chew a piece of bread for long enough it will actually start to taste sweet (try it at home if you don't believe me!). This is because the starch in the bread is being broken down into sugars, thanks to the enzymes in the saliva.

Starch is broken down in the mouth, stomach and small intestine by the enzyme amylase.

 

Proteins

Proteins are broken down into small molecules called amino acids. The digestion of proteins occurs in the stomach and small intestine, with the help of the enzyme protease. The acid in the stomach also helps digestion.  

 

Fats

Fats are broken down into small molecules called fatty acids. The digestion of fats occurs in the small intestine with the help of the enzyme lipase.

 

Other foods

Vitamins, minerals and water are all small enough to be absorbed into the body without being digested.  

Some fibres, however, cannot be broken down by any digestive enzyme, which is why they are not digested.  

Complete this sentence using the words below:

 

Food is _____A______ by ____B_____ in the digestive system to form _____C______ molecules which can be _____D_____ into the blood. This is because there are enzymes in the mouth as well as in the rest of the gut.

 ABCD
enzymes
absorbed
digested
smaller

Stomach and intestines

 

Name organs A and B using the table below:

 esophagusstomachlarge intestinesmall intestine
A
B

The digestive enzymes are all produced in which organ?

liver

pancreas

appendix

lungs

During digestion, starch is broken down into which small molecules?

fatty acids

sugars

amino acids

fats

In the text box below, write the word which completes this sentence:

 

Amino acids are the small molecules produced during the digestion of _____________.

Where in the body are proteins broken down? Tick two boxes.

mouth

stomach

small intestine

large intestine

 Match the food type with the correct enzyme used to digest it.  

Column A

Column B

carbohydrates
lipase
proteins
protease
fats
amylase

Where in the body is starch broken down into sugars? Tick three boxes.

mouth

stomach

small intestine

large intestine

Where in the body are the following enzymes found? (Remember enzymes can be found in more than one organ).

 AmylaseProteaseLipase
Salivary gland
Stomach
Pancreas
Small Intestine

Match the correct food type with the small molecule produced during its digestion.  

 CarbohydratesProteinsFatsFibre
Fatty acids
Sugars
Amino acids
Not digested
  • Question 1

Complete this sentence using the words below:

 

Food is _____A______ by ____B_____ in the digestive system to form _____C______ molecules which can be _____D_____ into the blood. This is because there are enzymes in the mouth as well as in the rest of the gut.

CORRECT ANSWER
 ABCD
enzymes
absorbed
digested
smaller
EDDIE SAYS
Hopefully that was OK. Enzymes do the digesting, breaking the large food molecules down into smaller molecules, so that they can fit across the gut wall and into the bloodstream.
  • Question 2

Stomach and intestines

 

Name organs A and B using the table below:

CORRECT ANSWER
 esophagusstomachlarge intestinesmall intestine
A
B
EDDIE SAYS
Organ A is the stomach, where our food is broken down further. Organ B is the small intesting, where vitamins and minerals are absorbed into our bodies.
  • Question 3

The digestive enzymes are all produced in which organ?

CORRECT ANSWER
pancreas
EDDIE SAYS
The digestive enzymes are produced in the pancreas, which is a large gland situated behind the stomach.
  • Question 4

During digestion, starch is broken down into which small molecules?

CORRECT ANSWER
sugars
EDDIE SAYS
Starch (from carbohydrates) is broken down into sugars by the enzyme amylase.
  • Question 5

In the text box below, write the word which completes this sentence:

 

Amino acids are the small molecules produced during the digestion of _____________.

CORRECT ANSWER
protein
proteins
EDDIE SAYS
Proteins are broken down by the enzyme protease to produce amino acids.
  • Question 6

Where in the body are proteins broken down? Tick two boxes.

CORRECT ANSWER
stomach
small intestine
EDDIE SAYS
The enzyme protease is found in the stomach and small intestine, and breaks proteins down into amino acids.
  • Question 7

 Match the food type with the correct enzyme used to digest it.  

CORRECT ANSWER

Column A

Column B

carbohydrates
amylase
proteins
protease
fats
lipase
EDDIE SAYS
Carbohydrates are broken down into sugars by amylase, proteins are broken down into amino acids by protease and fats are broken down into fatty acids by the enzyme lipase.
  • Question 8

Where in the body is starch broken down into sugars? Tick three boxes.

CORRECT ANSWER
mouth
stomach
small intestine
EDDIE SAYS
Starch is broken down into sugars by the enzyme amylase, which is found in the mouth, stomach and small intestine.
  • Question 9

Where in the body are the following enzymes found? (Remember enzymes can be found in more than one organ).

CORRECT ANSWER
 AmylaseProteaseLipase
Salivary gland
Stomach
Pancreas
Small Intestine
EDDIE SAYS
All of these enzymes are secreted by the pancreas. Amylase is found in the salivary gland (mouth), stomach and small intestine. Protease is also found in the stomach and small intestine, and lipase is found in the small intestine.
  • Question 10

Match the correct food type with the small molecule produced during its digestion.  

CORRECT ANSWER
 CarbohydratesProteinsFatsFibre
Fatty acids
Sugars
Amino acids
Not digested
EDDIE SAYS
Have you got that all right? If not, make a little chart of this answer and learn it!
---- OR ----

Sign up for a £1 trial so you can track and measure your child's progress on this activity.

What is EdPlace?

We're your National Curriculum aligned online education content provider helping each child succeed in English, maths and science from year 1 to GCSE. With an EdPlace account you’ll be able to track and measure progress, helping each child achieve their best. We build confidence and attainment by personalising each child’s learning at a level that suits them.

Get started
laptop

Start your £1 trial today.
Subscribe from £10/month.