Pearson Edexcel International GCSE (9–1) 4BI1/1B 4SD0/1B Biology UNIT: 4BI1 Science (Double Award) 4SD0 PAPER: 1B MAY 2025 Questions paper + markscheme

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Pearson Edexcel International GCSE (9–1)
Tuesday 13 May 2025
Afternoon (Time: 2 hours) Paper
reference 4BI1/1B 4SD0/1B

Biology  


UNIT: 4BI1
Science (Double Award) 4SD0
PAPER: 1B

You must have: Total Marks
Calculator, ruler



Instructions
•• Use black ink or ball-point pen.
If pencil is used for diagrams/sketches/graphs it must be dark (HB or B).
• Fill in the boxes at the top of this page with your name,
centre number and candidate number.
•• Answer all questions.
Answer the questions in the spaces provided
– there may be more space than 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 brackets
– use this as a guide as to how much time to spend on each question.

Advice
•• Read each question carefully before you start to answer it.
Write your answers neatly and in good English.
•• Try to answer every question.
Check your answers if you have time at the end.


Turn over


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©2025 Pearson Education Ltd.
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, Answer ALL questions. Write your answers in the spaces provided.
Some questions must be answered with a cross in a box . If you change your mind about an




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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




S




(a) (i) Which group contains Euglena?
(1)

A bacteria

B fungi

C protoctists

D viruses




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, (ii) Which structure is the site of respiration?
(1)
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A P

B R

C T

D U

(iii) Which structure contains chromosomes?
(1)

A P

B Q

C R

D T

(iv) Which structure is the cell membrane?
(1)

A P

B Q

C R

D U

(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 in animal cells?
(1)

A P

B Q

C S

D T




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, (c) Some of the labelled structures are known as organelles.
State what is meant by the term organelle.




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(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 .. . . . . . .. .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................................ . . . . . . . . . . . . . . . . . . . .

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. . . . . . . . . . . .. .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................................ . . . . . . . . . . . . . . . . . . . .



2 .. . . . . . .. .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................................ . . . . . . . . . . . . . . . . . . . .

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. . . . . . . . . . . .. .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................................ . . . . . . . . . . . . . . . . . . . .


(Total for Question 1 = 9 marks)




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