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End of Unit Test
8A
Name
8
A
Class
1 a The mouth contains teeth. What do teeth do to our food when we chew?
It breaks the food down
[1 mark]
b What are the names of the organs labelled
in the diagram?
Organ A is stomach
mouth
A
Organ B is small intestine
Organ C is large intestine
Organ D is anus
rectum
[ 2 marks]
c What occurs in organ A? food mixes with acids
stomach mixes up food/digests protein
B
C
D
[1 mark]
2 John has become overweight in the last few years. He has changed jobs from being
a coalminer to working in an office.
a Why do you think that John has become overweight?
Because he is not that active as before
[ā€“21 mark]
b His doctor says that he runs the risk of a health problem if he continues to put
on weight. What is this health risk?
Heart attack
[ā€“21 mark]
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8A
8
A
End of Unit Test (continued)
c Suggest two ways in which John might lose mass.
i
Do Sports
ii Be on a healthy diet
[1 mark]
3 a Name one food that contains a lot of protein.
meat
[1 mark]
b What are proteins used for in the body?
For growth and repair
[1 mark]
4 Look at this nutrition information label:
KLOGGS SUPERFLAKES
Amount per 100 g
Energy
Carbohydrate
1300 kJ
66 g
Protein
5g
Fat
5g
Fibre
6g
Calcium
30 mg
a What does the ā€˜kJā€™ stand for in the energy row?
Kilo joules
[1 mark]
b What type of food substances are calcium compounds?
minerals
[1 mark]
c Why is fibre important in the diet?
Keeps the intestines clean
[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 this 18 g?
water
[1 mark]
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8A
End of Unit Test (continued)
8
A
5 Look at the drawing below.
a In which organ are these structures found?
small intestine
[1 mark]
b What name is given to these structures?
villi
[1 mark]
c How do these structures help food be absorbed?
increase the surface area
[1 mark]
6 The diagram shows a model that can be used to represent what happens in the
digestive system.
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.
In the visking tube only
a Where will starch be found? In the water
[1 mark]
b Where will sugar be found? In the tube
In bothe the visking tube and the water
[1 mark]
c In the model, what does the water represent? blood
[1 mark]
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8A
7 a Blood plasma contains digested substances dissolved in it. One of them is the
energy source for respiration. What is the name of this substance?
glucose
[1 mark]
b Respiration releases energy in cells. List two ways in which the body uses
this energy.
i moving
ii keeping warm
[1 mark]
8 The graph shows how
the activity of a human
digestive enzyme varies
with temperature.
Speed at which
enzime works
8
A
End of Unit Test (continued)
0
10
20
30
40
Temperature (°C)
50
60
a The enzyme works best at about 37 °C. Why do you think that is?
Because that is the body temperature
[1 mark]
In another experiment, the activity of the enzyme was measured at three pHs: pH 2,
pH 7 and pH 9.
b If the enzyme is produced by the stomach, at which pH would it work best?
ph 2
[1 mark]
c If the enzyme is produced by the small intestine, at which pH would it work
best?
ph 7
[1 mark]
d The enzyme did not digest starch at any pH. Explain why.
The enzymes dont break down starch
[1 mark]
e Apart from the stomach, mouth and small intestine, name another organ that
produces digestive enzymes. pancreas
[1 mark]
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