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) 4BI1/1B
Paperreferen
4SD0/1B
Biology ce
🟐 🟐
UNIT: 4BI1
Science (Double Award) 4SD0
PAPER: 1B
You must have: Total Marks
Calculator, ruler
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. Write your answers in the spaces provided.
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 Euglena is a microorganism that lives in water.
The diagram shows Euglena with some structures labelled.
P
U Q
R
T
AREA
DO NOT WRITE IN THIS
S
(a) (i) Which group contains
Euglena? (1)
A bacteria
AREA
DO NOT WRITE IN THIS
B fungi
C protoctists
D viruses
, (ii) Which structure is the site of respiration?
(1)
A P
DO NOT WRITE IN THIS
B R
C T
D U
(iii) Which structure contains chromosomes?
AREA
(1)
A P
B Q
C R
D T
(iv) Which structure is the cell membrane?
DO NOT WRITE IN THIS
(1)
A P
B Q
C R
D U
AREA
(b) Euglena has some structures that are found in plant cells but not in
animal cells. Which labelled structure is found in plant cells but not
(1)
in animal cells?
A P
B Q
C S
DO NOT WRITE IN THIS
D T
AREA
, (c) Some of the labelled structures are known as organelles.
State what is meant by the term organelle.
AREA
DO NOT WRITE IN THIS
(1)
......... ........... ........... ........... .......... ........... ........... ........... ........... ........... ............ ........ ...... ........... ........... ........... ........... ........... ........... ........... ........... ........... ........... ........... ......................
......... ........... ........... ........... .......... ........... ........... ........... ........... ........... ............ ........ ...... ........... ........... ........... ........... ........... ........... ........... ........... ........... ........... ........... ......................
(d) Explain which two labelled structures allow Euglena to move through water.
Refer to the diagram and your own knowledge in your answer.
(3)
1 ............ ........... ........... ........... .......... ........... ........... ........... ........... ........... ........... ...... .......... ........... ........... ........... ........... ........... ........... ........... ........... ........... ........... ....... .................
......... ........... ........... ........... .......... ........... ........... ........... ........... ........... ............ ........ ............. ........... ........... ........... ........... ........... ........... ........... ........... ........... ........... .... ......................
......... ........... ........... ........... .......... ........... ........... ........... ........... ........... ............ ........ ...... ........... ........... ........... ........... ........... ........... ........... ........... ........... ........... ........... ......................
2 ............ ........... ........... ........... .......... ........... ........... ........... ........... ........... ........... ......
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.......... ........... ........... ........... ........... ........... ........... ........... ........... ........... ........... ....... .................
......... ........... ........... ........... .......... ........... ........... ........... ........... ........... ............ ........ ............. ........... ........... ........... ........... ........... ........... ........... ........... ........... ........... .... ......................
......... ........... ........... ........... .......... ........... ........... ........... ........... ........... ............ ........ ...... ........... ........... ........... ........... ........... ........... ........... ........... ........... ........... ........... ......................
(Total for Question 1 = 9 marks)
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candidate information
Candidate surnameOther names
Centre Number Candidate Number
Pearson Edexcel International
GCSE (9–1)
Tuesday 13 May 2025
Afternoon (Time: 2 hours) 4BI1/1B
Paperreferen
4SD0/1B
Biology ce
🟐 🟐
UNIT: 4BI1
Science (Double Award) 4SD0
PAPER: 1B
You must have: Total Marks
Calculator, ruler
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. Write your answers in the spaces provided.
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 Euglena is a microorganism that lives in water.
The diagram shows Euglena with some structures labelled.
P
U Q
R
T
AREA
DO NOT WRITE IN THIS
S
(a) (i) Which group contains
Euglena? (1)
A bacteria
AREA
DO NOT WRITE IN THIS
B fungi
C protoctists
D viruses
, (ii) Which structure is the site of respiration?
(1)
A P
DO NOT WRITE IN THIS
B R
C T
D U
(iii) Which structure contains chromosomes?
AREA
(1)
A P
B Q
C R
D T
(iv) Which structure is the cell membrane?
DO NOT WRITE IN THIS
(1)
A P
B Q
C R
D U
AREA
(b) Euglena has some structures that are found in plant cells but not in
animal cells. Which labelled structure is found in plant cells but not
(1)
in animal cells?
A P
B Q
C S
DO NOT WRITE IN THIS
D T
AREA
, (c) Some of the labelled structures are known as organelles.
State what is meant by the term organelle.
AREA
DO NOT WRITE IN THIS
(1)
......... ........... ........... ........... .......... ........... ........... ........... ........... ........... ............ ........ ...... ........... ........... ........... ........... ........... ........... ........... ........... ........... ........... ........... ......................
......... ........... ........... ........... .......... ........... ........... ........... ........... ........... ............ ........ ...... ........... ........... ........... ........... ........... ........... ........... ........... ........... ........... ........... ......................
(d) Explain which two labelled structures allow Euglena to move through water.
Refer to the diagram and your own knowledge in your answer.
(3)
1 ............ ........... ........... ........... .......... ........... ........... ........... ........... ........... ........... ...... .......... ........... ........... ........... ........... ........... ........... ........... ........... ........... ........... ....... .................
......... ........... ........... ........... .......... ........... ........... ........... ........... ........... ............ ........ ............. ........... ........... ........... ........... ........... ........... ........... ........... ........... ........... .... ......................
......... ........... ........... ........... .......... ........... ........... ........... ........... ........... ............ ........ ...... ........... ........... ........... ........... ........... ........... ........... ........... ........... ........... ........... ......................
2 ............ ........... ........... ........... .......... ........... ........... ........... ........... ........... ........... ......
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.......... ........... ........... ........... ........... ........... ........... ........... ........... ........... ........... ....... .................
......... ........... ........... ........... .......... ........... ........... ........... ........... ........... ............ ........ ............. ........... ........... ........... ........... ........... ........... ........... ........... ........... ........... .... ......................
......... ........... ........... ........... .......... ........... ........... ........... ........... ........... ............ ........ ...... ........... ........... ........... ........... ........... ........... ........... ........... ........... ........... ........... ......................
(Total for Question 1 = 9 marks)
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