Download 6.1-6.2 REVISION PACK - REVISION-IB2

6.1-6.2 REVISION PACK
1.
What sequence of organs do substances pass through, as they move through the human digestive
system?
A. Mouth  stomach  pancreas  small intestine  liver  large intestine  anus
B. Mouth  stomach  small intestine  pancreas  liver  large intestine  anus
C. Mouth  esophagus  stomach  small intestine  large intestine  anus
D. Mouth  esophagus  stomach  large intestine  small intestine  anus
(Total 1 mark)
2.
Which types of enzyme are found in the human digestive system?
I.
Amylases
II.
Proteases
III.
Lipases
A.
I and II only
B.
I and III only
C.
II and III only
D.
I, II and III
(Total 1 mark)
3.
What is absorption?
A.
Food entering the mouth and being chewed
B.
Food entering the stomach for digestion
C.
Taking digested food into the blood stream
D.
Making complex organic molecules in cells using digested foods
(Total 1 mark)
1
4.
In the digestive system, enzyme A has an optimum pH of 1.5 and enzyme B an optimum
pH of 7.
What are the possible substrates of these enzymes?
Enzyme A
Enzyme B
A.
proteins
amino acids
B.
lipids
proteins
C.
carbohydrates
lipids
D.
proteins
lipids
(Total 1 mark)
5.
The diagram below shows a section through the lower part of the heart, with two of the heart’s
four chambers visible.
Labels X and Y show the walls of two chambers of the heart. Which two chambers are they?
X
Y
A.
Right ventricle
Right atrium
B.
Left atrium
Right atrium
C.
Left ventricle
Right ventricle
D.
Right ventricle
Left ventricle
(Total 1 mark)
2
6.
The diagram below shows the human heart. Which parts contain the most oxygenated blood?
A.
P and T
B.
Q, R and S
C.
T, U, V and W
D.
T, U, R and S
(Total 1 mark)
7.
What is happening in the heart when the semi-lunar valves are closed?
I.
Blood is entering the aorta.
II.
Blood is entering the pulmonary artery.
III.
Blood is entering the ventricles.
IV.
The ventricles are contracting.
A.
I and II only
B.
I and III only
C.
III only
D.
III and IV only
(Total 1 mark)
3
8.
What does the body use to control the heartbeat?
I.
Adrenalin
II.
Pacemaker
III.
Nerves from brain
A.
II and III only
B.
I and II only
C.
I, II and III
D.
I and III only
(Total 1 mark)
9.
Draw a diagram of the human digestive system.
(Total 4 marks)
4
10.
Describe the role of enzymes in the process of digestion of proteins, carbohydrates and lipids in
humans.
(Total 6 marks)
11.
The surface area to volume ratio is an important variable in determining biological structure.
(a)
Define the term absorption.
.....................................................................................................................................
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(1)
(b)
Figure 1 below shows a cross-section through the small intestine and Figure 2 an enlarged
longitudinal section through a single villus.
Figure 1
[Source: adapted from M Roberts et al.,
Advanced Biology, Nelson, 2000, page 185]
Figure 2
[Source: adapted from Taylor et al.,
Biological Science 1
Cambridge University Press, 1997, page 244]
5
Using these diagrams, outline three ways in which the structure of the small intestine is
related to its function of absorbing food.
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(3)
(Total 7 marks)
6