2025 Pearson Edexcel GCE Biology B Advanced Subsidiary
PAPER 2: Core Physiology and Ecology Combined Question Paper and Marking Scheme
Please check the examination details below before entering your candidate information
Candidate surname Other names
Centre Number Candidate Number
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
You must have: Total Marks
Scientific calculator, HB pencil, ruler
Instructions
•• Use black ink or ball‑point pen.
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.
Information
•• The total mark for this paper is 80.
The marks for each question are shown in brackets
– use this as a guide as to how much time to spend on each question.
• Instructure
question(s) marked with an asterisk (*), marks will be awarded for your ability to
your answer logically, showing how the points that you make are related or
follow from each other where appropriate.
Advice
• Read each question carefully before you start to answer it.
• Check
Try to answer every question.
• your answers if you have time at the end.
Turn over
P78690A
©2025 Pearson Education Ltd.
,Y:1/1/1/1/1/
, Answer ALL questions.
Some questions must be answered with a cross in a box . If you change your mind about an
DO NOT WRITE IN THIS AREA
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
DO NOT WRITE IN THIS AREA
S
V U T
(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
DO NOT WRITE IN THIS AREA
B R
C S
D U
2
, (iii) Which structure allows water molecules into the cell?
(1)
DO NOT WRITE IN THIS AREA
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
............................................................................................................................... ............................................................................................................................... ......................
............................................................................................................................... ............................................................................................................................... ......................
............................................................................................................................... ............................................................................................................................... ......................
DO NOT WRITE IN THIS AREA
............................................................................................................................... ............................................................................................................................... ......................
............................................................................................................................... ............................................................................................................................... ......................
............................................................................................................................... ............................................................................................................................... ......................
Sodium ions
............................................................................................................................... ............................................................................................................................... ......................
............................................................................................................................... ............................................................................................................................... ......................
............................................................................................................................... ............................................................................................................................... ......................
............................................................................................................................... ............................................................................................................................... ......................
DO NOT WRITE IN THIS AREA
............................................................................................................................... ............................................................................................................................... ......................
............................................................................................................................... ............................................................................................................................... ......................
............................................................................................................................... ............................................................................................................................... ......................
............................................................................................................................... ............................................................................................................................... ......................
(Total for Question 1 = 7 marks)
3
Turn over
PAPER 2: Core Physiology and Ecology Combined Question Paper and Marking Scheme
Please check the examination details below before entering your candidate information
Candidate surname Other names
Centre Number Candidate Number
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
You must have: Total Marks
Scientific calculator, HB pencil, ruler
Instructions
•• Use black ink or ball‑point pen.
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.
Information
•• The total mark for this paper is 80.
The marks for each question are shown in brackets
– use this as a guide as to how much time to spend on each question.
• Instructure
question(s) marked with an asterisk (*), marks will be awarded for your ability to
your answer logically, showing how the points that you make are related or
follow from each other where appropriate.
Advice
• Read each question carefully before you start to answer it.
• Check
Try to answer every question.
• your answers if you have time at the end.
Turn over
P78690A
©2025 Pearson Education Ltd.
,Y:1/1/1/1/1/
, Answer ALL questions.
Some questions must be answered with a cross in a box . If you change your mind about an
DO NOT WRITE IN THIS AREA
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
DO NOT WRITE IN THIS AREA
S
V U T
(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
DO NOT WRITE IN THIS AREA
B R
C S
D U
2
, (iii) Which structure allows water molecules into the cell?
(1)
DO NOT WRITE IN THIS AREA
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
............................................................................................................................... ............................................................................................................................... ......................
............................................................................................................................... ............................................................................................................................... ......................
............................................................................................................................... ............................................................................................................................... ......................
DO NOT WRITE IN THIS AREA
............................................................................................................................... ............................................................................................................................... ......................
............................................................................................................................... ............................................................................................................................... ......................
............................................................................................................................... ............................................................................................................................... ......................
Sodium ions
............................................................................................................................... ............................................................................................................................... ......................
............................................................................................................................... ............................................................................................................................... ......................
............................................................................................................................... ............................................................................................................................... ......................
............................................................................................................................... ............................................................................................................................... ......................
DO NOT WRITE IN THIS AREA
............................................................................................................................... ............................................................................................................................... ......................
............................................................................................................................... ............................................................................................................................... ......................
............................................................................................................................... ............................................................................................................................... ......................
............................................................................................................................... ............................................................................................................................... ......................
(Total for Question 1 = 7 marks)
3
Turn over
