1. 1) Name two foods that contain:
a) Carbohydrates: (2 marks)
Bread, potatoes, pasta
b) Proteins: (2 marks)
Steak, chicken, peanuts, soya beans, fish , eggs
c) Vitamins: (2 marks)
Oranges, bananas, carrots, broccoli, vegetables
d) Minerals: (2 marks)
Oranges, bananas, carrots, broccoli, milk
e) Fibers:
Potatoes, bran cereal, bread, broccoli, vegetables
(2 marks)
2) Complete the following table:
Food Group Importance
(2 marks)
Proteins Growth and Repair
(2 marks)
Carbohydrates Provide energy
Provide energy and used to (2 marks)
Fats
make cell membranes
Fibers Help movement of food in intestines (2 marks)
3) What is a balanced diet?
A balanced diet is nothing but a diet which includes right
amount of all the nutrients (3 marks)
TOTAL MARKS /21
Page 1 of 6

2. 4) Draw lines from the boxes of the first column to match the correct amount of energy
needs of the second columns
Boy 12-15 years 11000 KJ/day
(2 marks)
Female office worker 9800 KJ/day (2 marks)
Male office worker 15000 KJ/day (2 marks)
Male manual worker 11700 KJ/day (2 marks)
5) Explain the difference of the structure of carbohydrates and proteins. Your answer
should also include a diagram.
Carbohydrates are made of large chains of identical sugar molecules
Proteins are made of large chains of different molecules called amino acid
(7 marks)
6) What do we mean by “digestion of food”? Why do we need to digest our food?
Digestion is the process of breaking large molecules of food to smaller molecules of food
The large molecules are insoluble, which means they do not dissolve in water. The small molecules
we produce in digestion are soluble, which means they dissolve in water so they pass through the
small intestine and into the blood
(4 marks)
TOTAL MARKS /19
7) Complete the following sentences using the words in the brackets below. There are
some extra words that you will not use.
Page 2 of 6

3. a) More carbohydrate and fat are needed to supply energy to active people (2 marks)
b) If people eat more energy-containing food than they need, the surplus is stored as fat
c) A lack of fibre in the diet may also increase the risk of developing bowel cancer (1 mark)
d) Too little protein in the diet stunts growth. (1 mark)
e) Carbohydrates are found in potatoes. (1 mark)
f) Being overweight may increase stress on the heart (1 mark)
(1 mark)
g) The recommended daily amount of protein that should be eaten is 72 grams for a
16-year old and 69 grams for a 35-year old. The reason is because protein are needed
(1 mark)
for growth. (1 mark)
( vitamin fat protein protein active lungs carbohydrates
stomach fat fiber heart growth water )
8) Complete the following table using the words and phrases in the box. There are some
extra words that you will not use.
Mineral or Vitamin or
Use in the body Deficiency disease Symptoms of disease
Food
Calsium Growing bones Rickets Leg bones bend (2 marks)
Reduced number of
Iron Making Haemoglobin Anaemia red blood cells, (2 marks)
tiredness
Vitamin D Helps absorb calsium Rickets Leg bones bend (2 marks)
Keeps skin and blood (2 marks)
Vitamin C Scurvy Wounds fail to heal
vessels healthy
Helps movement of
Faeces hard to pass
Fiber food through Constipation (2 marks)
through bowel
intestines
Improves eyesight Leg bones bend Vitamin D Carbohydrates Rickets
Wounds fail to heal Fiber Making haemoglobin Calcium Makes you stronger
Anaemia Heart Problems Vitamin C Osteoporosis Constipation Proteins
Dizziness Diarrhea
TOTAL MARKS /19
9) What are the enzymes? Write down the three types of enzymes you need to know about
and what do they do
Page 3 of 6

4. a) Carbohydrase: (6 marks)
Breaks down carbohydrates into smaller sugar molecules
b) Protease:
Breaks down proteins into amino acids
c) Lipase:
Breaks down fats into smaller fatty acids and glycerol
10) Describe in detail what happens to food in the digestive system.
(Hint! You should include all the processes that occur in different parts of digestive
system starting from the mouth)
- Food is firstly broken down (mechanical breakdown) into smaller parts by the teeth in the mouth.
It is then mixed with saliva and swallowed.
- Food enters the stomach, which is basically a muscular bag, filled with hydrochloric acid (HCl).
Here food is chemically break down
- Food enters the small intestine from the stomach. It passes along the small intestine where the
soluble food is taken into the blood through the walls.
- The remains of the food are then passed on to large intestine. All that is left is waste material and
water. The body will want to leave the waste material within the digestive system but the water is
valuable and so it is re-absorbed here.The waste material is passed to the rectum where it is stored
until it leaves the body through the anus
(10 marks)
TOTAL MARKS /16
11) True (T) or False (F)
a) Carbohydrates, proteins and fat are insoluble - T (1 marks)
b) Large insoluble substances are broken down into smaller insoluble substances - F (1 marks)
c) The wall of the stomach absorbs digested food - F (1 marks)
d) In the large intestine much of the water is absorbed back into the blood stream - T (1 marks)
e) The indigestible food goes back to the stomach to be chemically broken down by
hydrochloric acid - F (1 marks)
f) It is better if we don’t include any fats in our diet - F (1 marks)
g) If you want to lose weight you should not eat carbohydrates which are full of energy - F (1 marks)
Page 4 of 6

5. h) A lack of fiber in the diet may increase the risk of develop anaemia - F (1 marks)
i) Hydrochloric acid in the stomach breaks down fats - F (1 marks)
j) The girls in this classroom need more energy than their mums - T (1 marks)
k) The process of breaking down carbohydrates to smaller molecules is called
emulsification - F (1 marks)
l) Singer Bruno Mars in “The Lazy Song” says that today he is not doing anything and that
he is going to lie in bed all day. Therefore he doesn’t need energy for today - F (1 marks)
12) Describe the processes of digesting fats
Fats are digested in two stages:
- Bile breaks down the fat up into smaller droplets
- An enzyme called lipase breaks the fats down into the smaller fatty acid molecules and
glycerol
(3 marks)
TOTAL MARKS /15
13) Find which number of the pie chart corresponds to each food category
Page 5 of 6

6. Food for growth 4
(2marks)
Carbohydrates 1 or 2
(2marks)
Fat and Sugar 5
(2marks)
Dairy Foods 3
(2marks)
Fruit and Vegetables 2 or 1
(2marks)
TOTAL MARKS /10
Page 6 of 6