Please write clearly in block capitals.
Centre number Candidate number
Surname
Forename(s)
Candidate signature
I declare this is my own work.
AS
BIOLOGY
Paper 1
Monday 11 May 2026 Morning Time allowed: 1 hour 30 minutes
Materials For Examiner’s Use
For this paper you must have:
Question Mark
• a ruler with millimetre measurements
• a scientific calculator. 1
2
Instructions
3
• Use black ink or black ball-point pen.
• Fill in the boxes at the top of this page. 4
• Answer all questions. 5
• You must answer the questions in the spaces provided. Do not write 6
outside the box around each page or on blank pages.
7
• If you need extra space for your answer(s), use the lined pages at the end of
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.
*jun *
IB/M/Jun26/G4003/V5 7401/1
, 2
Do not write
outside the
Answer all questions in the spaces provided. box
0 1 . 1 Describe the function of a chloroplast.
[2 marks]
0 1 . 2 Figure 1 shows a chloroplast.
Figure 1
Name the parts of the chloroplast labelled A and B.
[2 marks]
A
B
*02*
IB/M/Jun26/7401/1
, 3
Do not write
outside the
0 1 . 3 In a particular plant cell: box
• the volume of the nucleus is 523 μm3
• the diameter of the nucleolus is 5 μm
• it is assumed both the nucleus and nucleolus are spherical.
4πr3
Volume of a sphere =
3
Use π = 3.14
Calculate the percentage of the nucleus volume taken up by the nucleolus.
Show your working and give your answer to one decimal place.
[2 marks]
Answer % 6
Turn over for the next question
Turn over ►
*03*
IB/M/Jun26/7401/1
, 4
Do not write
outside the
0 2 . 1 Describe the biochemical test to confirm that glucose is a reducing sugar. box
[2 marks]
Figure 2 shows the structure of two β-glucose monomers.
Figure 2
0 2 . 2 On Figure 2, draw a box around one chemical group in each β-glucose molecule that
is used to form a bond in a condensation reaction.
Name the bond formed.
[2 marks]
Name of bond
*04*
IB/M/Jun26/7401/1
Centre number Candidate number
Surname
Forename(s)
Candidate signature
I declare this is my own work.
AS
BIOLOGY
Paper 1
Monday 11 May 2026 Morning Time allowed: 1 hour 30 minutes
Materials For Examiner’s Use
For this paper you must have:
Question Mark
• a ruler with millimetre measurements
• a scientific calculator. 1
2
Instructions
3
• Use black ink or black ball-point pen.
• Fill in the boxes at the top of this page. 4
• Answer all questions. 5
• You must answer the questions in the spaces provided. Do not write 6
outside the box around each page or on blank pages.
7
• If you need extra space for your answer(s), use the lined pages at the end of
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.
*jun *
IB/M/Jun26/G4003/V5 7401/1
, 2
Do not write
outside the
Answer all questions in the spaces provided. box
0 1 . 1 Describe the function of a chloroplast.
[2 marks]
0 1 . 2 Figure 1 shows a chloroplast.
Figure 1
Name the parts of the chloroplast labelled A and B.
[2 marks]
A
B
*02*
IB/M/Jun26/7401/1
, 3
Do not write
outside the
0 1 . 3 In a particular plant cell: box
• the volume of the nucleus is 523 μm3
• the diameter of the nucleolus is 5 μm
• it is assumed both the nucleus and nucleolus are spherical.
4πr3
Volume of a sphere =
3
Use π = 3.14
Calculate the percentage of the nucleus volume taken up by the nucleolus.
Show your working and give your answer to one decimal place.
[2 marks]
Answer % 6
Turn over for the next question
Turn over ►
*03*
IB/M/Jun26/7401/1
, 4
Do not write
outside the
0 2 . 1 Describe the biochemical test to confirm that glucose is a reducing sugar. box
[2 marks]
Figure 2 shows the structure of two β-glucose monomers.
Figure 2
0 2 . 2 On Figure 2, draw a box around one chemical group in each β-glucose molecule that
is used to form a bond in a condensation reaction.
Name the bond formed.
[2 marks]
Name of bond
*04*
IB/M/Jun26/7401/1
