000001
Please write clearly in block capitals.
Centre number Candidate number
Surname
Forename(s)
Candidate signature
I declare this is my own work.
AS
st
BIOLOGY
Paper 1 be
Monday 13 May 2024 Morning Time allowed: 1 hour 30 minutes
Materials For Examiner’s Use
he
For this paper you must have:
• a ruler with millimetre measurements Question Mark
• a scientific calculator. 1
2
Instructions
lt
• Use black ink or black ball-point pen. 3
• Fill in the boxes at the top of this page. 4
• Answer all questions. 5
al
• You must answer the questions in the spaces provided. Do not write
6
outside the box around each page or on blank pages.
• If you need extra space for your answer(s), use the lined pages at the end of 7
this book. Write the question number against your answer(s). 8
• Show all your working.
9
• Do all rough work in this book. Cross through any work you do not want
to be marked. TOTAL
Information
• The marks for the questions are shown in brackets.
• The maximum mark for this paper is 75.
*JUN247401101*
IB/M/Jun24/G4001/E9 7401/1
Page 1 of 33
,000002
2
Do not write
outside the
Answer all questions in the spaces provided. box
0 1 . 1 Figure 1 shows a diagram of the human gas exchange system.
Figure 1
st
be
Structure B is muscle. The volume of the thorax is increased when structure B
contracts.
Name the structures labelled A and B.
he
[2 marks]
A
lt
B
al
*02*
IB/M/Jun24/7401/1
Page 2 of 33
,000003
3
Do not write
outside the
0 1 . 2 Figure 2 is a diagram of an alveolus and a blood vessel associated with the alveolus. box
The direction of the movement of substances is shown by the arrows labelled C, D, E,
F and G.
Figure 2
st
be
Complete Table 1 by writing the correct letter, C, D, E, F or G, in the box next to each
statement. You may use each letter once, more than once or not at all.
[2 marks]
Table 1
he
Box Statement
represents the diffusion of oxygen
lt
represents the transport of a gas mixture
al
represents blood moving at the highest pressure
Turn over ►
*03*
IB/M/Jun24/7401/1
Page 3 of 33
, 000004
4
Do not write
outside the
0 1 . 3 Describe and explain one adaptation of a single alveolus for gas exchange. box
[2 marks]
6
st
be
he
lt
al
*04*
IB/M/Jun24/7401/1
Page 4 of 33
Please write clearly in block capitals.
Centre number Candidate number
Surname
Forename(s)
Candidate signature
I declare this is my own work.
AS
st
BIOLOGY
Paper 1 be
Monday 13 May 2024 Morning Time allowed: 1 hour 30 minutes
Materials For Examiner’s Use
he
For this paper you must have:
• a ruler with millimetre measurements Question Mark
• a scientific calculator. 1
2
Instructions
lt
• Use black ink or black ball-point pen. 3
• Fill in the boxes at the top of this page. 4
• Answer all questions. 5
al
• You must answer the questions in the spaces provided. Do not write
6
outside the box around each page or on blank pages.
• If you need extra space for your answer(s), use the lined pages at the end of 7
this book. Write the question number against your answer(s). 8
• Show all your working.
9
• Do all rough work in this book. Cross through any work you do not want
to be marked. TOTAL
Information
• The marks for the questions are shown in brackets.
• The maximum mark for this paper is 75.
*JUN247401101*
IB/M/Jun24/G4001/E9 7401/1
Page 1 of 33
,000002
2
Do not write
outside the
Answer all questions in the spaces provided. box
0 1 . 1 Figure 1 shows a diagram of the human gas exchange system.
Figure 1
st
be
Structure B is muscle. The volume of the thorax is increased when structure B
contracts.
Name the structures labelled A and B.
he
[2 marks]
A
lt
B
al
*02*
IB/M/Jun24/7401/1
Page 2 of 33
,000003
3
Do not write
outside the
0 1 . 2 Figure 2 is a diagram of an alveolus and a blood vessel associated with the alveolus. box
The direction of the movement of substances is shown by the arrows labelled C, D, E,
F and G.
Figure 2
st
be
Complete Table 1 by writing the correct letter, C, D, E, F or G, in the box next to each
statement. You may use each letter once, more than once or not at all.
[2 marks]
Table 1
he
Box Statement
represents the diffusion of oxygen
lt
represents the transport of a gas mixture
al
represents blood moving at the highest pressure
Turn over ►
*03*
IB/M/Jun24/7401/1
Page 3 of 33
, 000004
4
Do not write
outside the
0 1 . 3 Describe and explain one adaptation of a single alveolus for gas exchange. box
[2 marks]
6
st
be
he
lt
al
*04*
IB/M/Jun24/7401/1
Page 4 of 33
