CAMBRIDGE IGCSE™ BIOLOGY: END-OF-CHAPTER TEST 7
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Name Date
End-of-chapter 7 test
1 Figure 7.1 shows the human digestive system.
Figure 7.1
a Identify the correct sites at which the following four processes occur.
Absorption Egestion Ingestion Digestion
A P Q R S
B Q R S P
C R S P Q
D S P Q R
[1]
b Identify where amylase is active in the alimentary canal. Choose and circle the answer you
consider correct.
P and R B P and S C Q and R D Q and S [1]
[Total: 2]
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CAMBRIDGE IGCSE™ BIOLOGY: END-OF-CHAPTER TEST 7
2 Healthy teeth are required for the proper functioning of the alimentary canal.
a In the box below, draw a large, labelled longitudinal section of a human tooth.
Your diagram should show all layers.
[3]
b Explain why a diet rich in sugars is associated with tooth decay. You should refer to pH in
your answer.
_________________________________________________________________________
_________________________________________________________________________ [2]
c Mouthwash can be used to clean teeth after eating and this may reduce dental decay.
Describe how you could investigate whether the use of mouthwash after eating affects
the pH of plaque in a group of ten learners.
_________________________________________________________________________
_________________________________________________________________________
_________________________________________________________________________
_________________________________________________________________________
_________________________________________________________________________
_________________________________________________________________________ [5]
[Total: 10]
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CAMBRIDGE IGCSE™ BIOLOGY: END-OF-CHAPTER TEST 7
3 Fat is a component of a balanced diet that should not be consumed in excess.
a State one reason why fat is required by the body.
_________________________________________________________________________ [1]
b State one source of food that is rich in fat.
_________________________________________________________________________ [1]
c The digestion of fat and the absorption of its products can be affected by a range of
disorders. These include:
• gallstones (lead to blockage of the bile duct)
• pancreatitis (blocked release of pancreatic enzymes)
• coeliac disease (leads to damage to the microvilli of the small intestine).
Suggest and explain how each of these disorders prevents the normal digestion of fat and the
absorption of its products.
i Gallstones
________________________________________________________________________
________________________________________________________________________ [2]
ii Pancreatitis
________________________________________________________________________
________________________________________________________________________ [2]
iii Coeliac disease
________________________________________________________________________
________________________________________________________________________ [2]
[Total: 8]
[Test total: 20]
END OF TEST
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