8A End of Unit Test
8 Name Class Date
A
1 a The mouth contains teeth. What do teeth do to our food when we chew?
___________________________________________________________________________________
[1 mark]
b What are the names of the organs labelled in
the diagram? Choose from the list below: mouth
mouth stomach liver small intestine
lungs large intestine rectum A
Organ A is ______________________________
Organ B is ______________________________
B
Organ C is ______________________________ C
Organ D is ______________________________ D
[2 marks]
c What happens to food in organ A?
___________________________________________________________________________________
[1 mark]
2 a Give the name of one food that is a good source of protein.
__________________________________________________________________________________
[1 mark]
b What are proteins used for in the body?
__________________________________________________________________________________
[1 mark]
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8A End of Unit Test (continued)
3 John has become overweight in the last few years. He has changed jobs from being a gardener
to working in an office.
8
A
a John still eats the same amount of food that he used to when he was a gardener. Suggest one
reason why he is now overweight.
__________________________________________________________________________________
__________________________________________________________________________________
[1 mark]
b Suggest one health problem that John could have as a result of becoming overweight.
__________________________________________________________________________________
[1 mark]
c Suggest two ways in which John might lose mass.
i ____________________________________ ii ____________________________________
[1 mark]
4 Look at the nutritional information on the food label below:
a 100 g of Superflakes contain 1300 kJ of energy.
KLOGGS SUPERFLAKES
What does the unit ‘KJ stand for?
Amount per 100 g
Energy 1300 kJ ______________________________________________
Carbohydrate 66 g
Protein 5g [1 mark]
Fat 5g
Fibre 6g
Calcium 30 mg
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8A End of Unit Test (continued)
b What type of food substance is calcium?
8
A ___________________________________________________________________________________
[1 mark]
c Why is fibre important in the diet?
___________________________________________________________________________________
[1 mark]
d If you add up the masses of the food substances there appears to be nearly 18 g
missing. What substance makes up most of this 18 g?
___________________________________________________________________________________
[1 mark]
5 Look at the drawing of the villus below.
a In which organ are structures like these found? ______________________________________
[1 mark]
b Name one substance that is absorbed by the villi. ____________________________________
[1 mark]
c How does the pressure of these structures help with the absorption of digested food?
___________________________________________________________________________________
[1 mark]
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8A End of Unit test (continued)
6 The diagram shows a model that can be used to represent what happens in the
digestive system.
8
A
rubber band
boiling tube
Visking tubing
starch and saliva mixture
water
An enzyme in saliva digests starch into sugar. The apparatus above was left at 37 °C. After
5 minutes the contents of the Visking tubing and the water around it were tested for starch and
for sugar.
a Where will starch be found?
___________________________________________________________________________________
[1 mark]
b Where will sugar be found?
___________________________________________________________________________________
[1 mark]
c In the model, what does the water represent? ________________________________________
[1 mark]
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8A End of Unit Test (continued)
7 The graph shows how the activity of a human digestive enzyme varies with temperature.
8
A
Speed at which
enzyme works
0 10 20 30 40 50 60
Temperature (˚C)
a Look at the graph. Give one reason why it is important that the temperature of the human
body is kept at 37 ˚C.
___________________________________________________________________________________
[1 mark]
b At what pH do digestive enzymes work best in the stomach?
____________________________________ [1 mark]
c At what pH digestive enzymes work best in the small intestine?
____________________________________ [1 mark]
d Amylase is an enzyme that begins the digestion of starch in the mouth. Why does this enzyme
stop working when the food enters the stomach?
___________________________________________________________________________________
[1 mark]
8 a In the cells of our own bodies, energy is released during a process called respiration. Give two
ways in which the body uses this energy.
i _______________________________________________________________________________
ii _______________________________________________________________________________
[1 mark]
b Give the name of the substance from which energy is released during respiration.
___________________________________________________________________________________
[1 mark]
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