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MERGED QUESTION PAPER AND MARK SCHEME 2025 Pearson Edexcel Advanced Subsidiary GCEIn Biology B (8BI0) Paper 02: Core Physiology and Ecology

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MERGED QUESTION PAPER AND MARK SCHEME 2025 Pearson Edexcel Advanced Subsidiary GCEIn Biology B (8BI0) Paper 02: Core Physiology and Ecology

Institution
Biology
Course
Biology

Content preview

Pearson Edexcel GCE
Thursday 22 May 2025
Morning (Time: 1 hour 30 minutes) Paper
reference 8BI0/02
Biology B  


Advanced Subsidiary
PAPER 2: Core Physiology and Ecology

, Answer ALL questions.

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 The cell surface membrane controls transport into and out of the cell.
(a) The diagram shows a cell surface membrane with some structures labelled.

carbohydrate chain
P Q




R




S
V T
U

(i) Which of the following labelled structures is cholesterol?
(1)
A P

B Q

C S

D V


(ii) Which of the following labelled structures is an integral protein?
(1)
A Q

B R

C S

D U




2
*P78690A0232* 

, (iii) Which structure allows water molecules into the cell?
(1)
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A P

B Q

C T

D V


(b) Explain how the properties of oxygen and of sodium ions determine how they
enter a cell.
(4)
Oxygen

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Sodium ions

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(Total for Question 1 = 7 marks)




3
 *P78690A0332* Turn over

, 2 (a) The photograph shows a section through an artery and a vein, as seen using a
light microscope.




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Y

X




(Source: © BIOPHOTO ASSOCIATES/SCIENCE PHOTO LIBRARY)

(i) The actual diameter of the artery measured from X to Y is 1.2mm.
Calculate the magnification of this photograph.
(1)




Answer ........................................ . . . . . . . . . . . . . . . . . . . . . .

(ii) Explain how two features of that artery distinguish it from the vein shown in
the photograph.
(2)

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



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4



*P78690A0432* 

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Institution
Biology
Course
Biology

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