Please check the examination details below before entering your
candidate information
Candidate surnameOther names
Centre Number Candidate Number
Pearson Edexcel International
GCSE (9–1)
Tuesday 13 May 2025
Afternoon (Time: 2 hours)
referen 4BI1/1BR
Paper 4SD0/1BR
ce
Biology 🟐 🟐
UNIT: 4BI1
Science (Double Award) 4SD0
PAPER: 1BR
You must have: Total Marks
Ruler, calculator
Instructions
• Use black ink or ball-point
• If pencil is used for diagrams/sketches/graphs it must be dark
• Fill
pen.in
(HB or the boxes number
B). centre at the top of this
and page with
candidate your
number.
• provided – there may be more space
• Answer
name, all
Answer the questions in the spaces
• than
questions.
you need.
Show all the steps in any calculations and state the units.
Information
• The total mark for this paper is 110.
• The marks for each question are shown in
– use this as a guide as to how much time to spend on each question.
brackets
Advice
• Read each question carefully before you start to answer it.
• Write your answers neatly and in good
• Try to answer every
• Check your answers if you have time at the end.
English.
question.
Turn over
, Answer ALL questions.
Some questions must be answered with a cross in a box . If you
AREA
DO NOT WRITE IN THIS
change your mind about an answer, put a line through the box and
then mark your new answer with a cross .
1 The photograph shows a fungus called Mucor growing on an
agar plate. Cells within Mucor contain nuclei and
mitochondria.
AREA
DO NOT WRITE IN THIS
(a) (i) Which of these is a correct statement about the fungus, Mucor?
(1)
A Mucor is a eukaryotic organism with cell walls made of chitin
B Mucor is a eukaryotic organism with cell walls made of
cellulose
C Mucor is a prokaryotic organism with cell walls made of chitin
D Mucor is a prokaryotic organism with cell walls made of
cellulose
AREA
DO NOT WRITE IN THIS
(ii) Plant cells contain chloroplasts, cytoplasm and starch.
(1)
How many of these are also present in a fungus such as Mucor?
A 0
B 1
C 2
D 3
, (iii) The fungus in the diagram is circular with a radius of
45 mm. Calculate the area, in mm2 , of this circle.
Give your answer to 2 significant figures.
DO NOT WRITE IN THIS
[area = πr2 π = 3.14]
(2)
AREA
area of circle =.............................mm2
(b) Mucor can reproduce using asexual or sexual reproduction.
(i) State two differences between asexual and sexual reproduction.
(2)
DO NOT WRITE IN THIS
1 ............ ........... ........... ........... .......... ........... ........... ........... ........... ........... ........... ...... .......... ........... ........... ........... ........... ........... ........... ........... ........... ........... ........... ....... .................
......... ........... ........... ........... .......... ........... ........... ........... ........... ........... ............ ........ ............. ........... ........... ........... ........... ........... ........... ........... ........... ........... ........... .... ......................
2 ............ ........... ........... ........... .......... ........... ........... ........... ........... ........... ........... ...... .......... ........... ........... ........... ........... ........... ........... ........... ........... ........... ........... ....... .................
AREA
......... ........... ........... ........... .......... ........... ........... ........... ........... ........... ............ ........ ............. ........... ........... ........... ........... ........... ........... ........... ........... ........... ........... .... ......................
(ii) Explain why it is an advantage for Mucor to be able to
reproduce using sexual reproduction.
(2)
......... ........... ........... ........... .......... ........... ........... ........... ........... ........... ............ ........ ...... ........... ........... ........... ........... ........... ........... ........... ........... ........... ........... ........... ......................
......... ........... ........... ........... .......... ........... ........... ........... ........... ........... ............ ........ ...... ........... ........... ........... ........... ........... ........... ........... ........... ........... ........... ........... ......................
DO NOT WRITE IN THIS
......... ........... ........... ........... .......... ........... ........... ........... ........... ........... ............ ........ ...... ........... ........... ........... ........... ........... ........... ........... ........... ........... ........... ........... ......................
......... ........... ........... ........... .......... ........... ........... ........... ........... ........... ............ ........ ...... ........... ........... ........... ........... ........... ........... ........... ........... ........... ........... ........... ......................
(Total for Question 1 = 8 marks)
AREA
, 2 The diagram shows parts of the human respiratory system with
some structures labelled.
AREA
DO NOT WRITE IN THIS
lung
X
(a) (i) Which of these is the structure labelled X?
AREA
DO NOT WRITE IN THIS
(1)
A alveolus
B bronchiole
C bronchus
D trachea
(ii) State why a lung is described as an organ.
(1)
......... ........... ........... ........... .......... ........... ........... ........... ........... ........... ............ ........ ...... ........... ........... ........... ........... ........... ........... ........... ........... ........... ........... ........... ......................
......... ........... ........... ........... .......... ........... ........... ........... ........... ........... ............ ........ ...... ........... ........... ........... ........... ........... ........... ........... ........... ........... ........... ........... ......................
(iii) Explain how contraction of the diaphragm causes air to move into the lungs.
(3)
AREA
DO NOT WRITE IN THIS
......... ........... ........... ........... .......... ........... ........... ........... ........... ........... ............ ........ ...... ........... ........... ........... ........... ........... ........... ........... ........... ........... ........... ........... ......................
......... ........... ........... ........... .......... ........... ........... ........... ........... ........... ............ ........ ...... ........... ........... ........... ........... ........... ........... ........... ........... ........... ........... ........... ......................
......... ........... ........... ........... .......... ........... ........... ........... ........... ........... ............ ........ ...... ........... ........... ........... ........... ........... ........... ........... ........... ........... ........... ........... ......................
......... ........... ........... ........... .......... ........... ........... ........... ........... ........... ............ ........ ...... ........... ........... ........... ........... ........... ........... ........... ........... ........... ........... ........... ......................
......... ........... ........... ........... .......... ........... ........... ........... ........... ........... ............ ........ ...... ........... ........... ........... ........... ........... ........... ........... ........... ........... ........... ........... ......................
......... ........... ........... ........... .......... ........... ........... ........... ........... ........... ............ ........ ...... ........... ........... ........... ........... ........... ........... ........... ........... ........... ........... ........... ......................
candidate information
Candidate surnameOther names
Centre Number Candidate Number
Pearson Edexcel International
GCSE (9–1)
Tuesday 13 May 2025
Afternoon (Time: 2 hours)
referen 4BI1/1BR
Paper 4SD0/1BR
ce
Biology 🟐 🟐
UNIT: 4BI1
Science (Double Award) 4SD0
PAPER: 1BR
You must have: Total Marks
Ruler, calculator
Instructions
• Use black ink or ball-point
• If pencil is used for diagrams/sketches/graphs it must be dark
• Fill
pen.in
(HB or the boxes number
B). centre at the top of this
and page with
candidate your
number.
• provided – there may be more space
• Answer
name, all
Answer the questions in the spaces
• than
questions.
you need.
Show all the steps in any calculations and state the units.
Information
• The total mark for this paper is 110.
• The marks for each question are shown in
– use this as a guide as to how much time to spend on each question.
brackets
Advice
• Read each question carefully before you start to answer it.
• Write your answers neatly and in good
• Try to answer every
• Check your answers if you have time at the end.
English.
question.
Turn over
, Answer ALL questions.
Some questions must be answered with a cross in a box . If you
AREA
DO NOT WRITE IN THIS
change your mind about an answer, put a line through the box and
then mark your new answer with a cross .
1 The photograph shows a fungus called Mucor growing on an
agar plate. Cells within Mucor contain nuclei and
mitochondria.
AREA
DO NOT WRITE IN THIS
(a) (i) Which of these is a correct statement about the fungus, Mucor?
(1)
A Mucor is a eukaryotic organism with cell walls made of chitin
B Mucor is a eukaryotic organism with cell walls made of
cellulose
C Mucor is a prokaryotic organism with cell walls made of chitin
D Mucor is a prokaryotic organism with cell walls made of
cellulose
AREA
DO NOT WRITE IN THIS
(ii) Plant cells contain chloroplasts, cytoplasm and starch.
(1)
How many of these are also present in a fungus such as Mucor?
A 0
B 1
C 2
D 3
, (iii) The fungus in the diagram is circular with a radius of
45 mm. Calculate the area, in mm2 , of this circle.
Give your answer to 2 significant figures.
DO NOT WRITE IN THIS
[area = πr2 π = 3.14]
(2)
AREA
area of circle =.............................mm2
(b) Mucor can reproduce using asexual or sexual reproduction.
(i) State two differences between asexual and sexual reproduction.
(2)
DO NOT WRITE IN THIS
1 ............ ........... ........... ........... .......... ........... ........... ........... ........... ........... ........... ...... .......... ........... ........... ........... ........... ........... ........... ........... ........... ........... ........... ....... .................
......... ........... ........... ........... .......... ........... ........... ........... ........... ........... ............ ........ ............. ........... ........... ........... ........... ........... ........... ........... ........... ........... ........... .... ......................
2 ............ ........... ........... ........... .......... ........... ........... ........... ........... ........... ........... ...... .......... ........... ........... ........... ........... ........... ........... ........... ........... ........... ........... ....... .................
AREA
......... ........... ........... ........... .......... ........... ........... ........... ........... ........... ............ ........ ............. ........... ........... ........... ........... ........... ........... ........... ........... ........... ........... .... ......................
(ii) Explain why it is an advantage for Mucor to be able to
reproduce using sexual reproduction.
(2)
......... ........... ........... ........... .......... ........... ........... ........... ........... ........... ............ ........ ...... ........... ........... ........... ........... ........... ........... ........... ........... ........... ........... ........... ......................
......... ........... ........... ........... .......... ........... ........... ........... ........... ........... ............ ........ ...... ........... ........... ........... ........... ........... ........... ........... ........... ........... ........... ........... ......................
DO NOT WRITE IN THIS
......... ........... ........... ........... .......... ........... ........... ........... ........... ........... ............ ........ ...... ........... ........... ........... ........... ........... ........... ........... ........... ........... ........... ........... ......................
......... ........... ........... ........... .......... ........... ........... ........... ........... ........... ............ ........ ...... ........... ........... ........... ........... ........... ........... ........... ........... ........... ........... ........... ......................
(Total for Question 1 = 8 marks)
AREA
, 2 The diagram shows parts of the human respiratory system with
some structures labelled.
AREA
DO NOT WRITE IN THIS
lung
X
(a) (i) Which of these is the structure labelled X?
AREA
DO NOT WRITE IN THIS
(1)
A alveolus
B bronchiole
C bronchus
D trachea
(ii) State why a lung is described as an organ.
(1)
......... ........... ........... ........... .......... ........... ........... ........... ........... ........... ............ ........ ...... ........... ........... ........... ........... ........... ........... ........... ........... ........... ........... ........... ......................
......... ........... ........... ........... .......... ........... ........... ........... ........... ........... ............ ........ ...... ........... ........... ........... ........... ........... ........... ........... ........... ........... ........... ........... ......................
(iii) Explain how contraction of the diaphragm causes air to move into the lungs.
(3)
AREA
DO NOT WRITE IN THIS
......... ........... ........... ........... .......... ........... ........... ........... ........... ........... ............ ........ ...... ........... ........... ........... ........... ........... ........... ........... ........... ........... ........... ........... ......................
......... ........... ........... ........... .......... ........... ........... ........... ........... ........... ............ ........ ...... ........... ........... ........... ........... ........... ........... ........... ........... ........... ........... ........... ......................
......... ........... ........... ........... .......... ........... ........... ........... ........... ........... ............ ........ ...... ........... ........... ........... ........... ........... ........... ........... ........... ........... ........... ........... ......................
......... ........... ........... ........... .......... ........... ........... ........... ........... ........... ............ ........ ...... ........... ........... ........... ........... ........... ........... ........... ........... ........... ........... ........... ......................
......... ........... ........... ........... .......... ........... ........... ........... ........... ........... ............ ........ ...... ........... ........... ........... ........... ........... ........... ........... ........... ........... ........... ........... ......................
......... ........... ........... ........... .......... ........... ........... ........... ........... ........... ............ ........ ...... ........... ........... ........... ........... ........... ........... ........... ........... ........... ........... ........... ......................
