2025 Pearson Edexcel Level 3 GCE Biology A {Salters Nuffield} Advanced PAPER 1: The Natural Environment and Species
Survival
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 Level 3 GCE
Thursday 5 June 2025
Afternoon (Time: 2 hours) Paper
reference 9BN0/01
Biology A (Salters Nuffield)
Advanced
PAPER 1: The Natural Environment and Species
Survival
You must have: Total Marks
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.
•• Show
Answer all questions.
all your working out in calculations and include units where appropriate.
• Answer the be
– there may questions in the
more space spaces
than provided
you need.
Information
•• The total mark for this paper is 100.
The marks for each question are shown in brackets
– use this as a guide as to how much time to spend on each question.
•• You may use a scientific calculator.
In questions marked with an asterisk (*), marks will be awarded for your ability to
structure your answer logically showing how the points that you make are related
or follow on from each other where appropriate.
Advice
• Read each question carefully before you start to answer it.
•• Check answer
Try to every question.
your answers if you have time at the end.
Turn over
,P78657A
©2025 Pearson Education Ltd.
Y:1/1/1/1/1/
, 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
DO NOT WRITE IN THIS AREA
answer, put a line through the box and then mark your new answer with a cross .
1 A sequence of changes takes place in the body of a mammal after death.
Forensic scientists can use this to help determine the time of death.
(a) State three changes that take place in the body of a mammal in the first 24 hours
after death.
(3)
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DO NOT WRITE IN THIS AREA
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(b) Insects lay eggs on the body and their larvae feed on the dead tissue.
(i) Which of the following describes the sequence of organisms that colonise a
body after death?
(1)
A bacteria, beetles, flies
B bacteria, flies, beetles DO NOT WRITE IN THIS AREA
C fungi, flies, bacteria
D beetles, flies, fungi
2
, (ii) Explain the effect of an increase in temperature on the rate of decomposition.
(3)
DO NOT WRITE IN THIS AREA
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(Total for Question 1 = 7 marks)
DO NOT WRITE IN THIS AREA
DO NOT WRITE IN THIS AREA
3
Turn over
Survival
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 Level 3 GCE
Thursday 5 June 2025
Afternoon (Time: 2 hours) Paper
reference 9BN0/01
Biology A (Salters Nuffield)
Advanced
PAPER 1: The Natural Environment and Species
Survival
You must have: Total Marks
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.
•• Show
Answer all questions.
all your working out in calculations and include units where appropriate.
• Answer the be
– there may questions in the
more space spaces
than provided
you need.
Information
•• The total mark for this paper is 100.
The marks for each question are shown in brackets
– use this as a guide as to how much time to spend on each question.
•• You may use a scientific calculator.
In questions marked with an asterisk (*), marks will be awarded for your ability to
structure your answer logically showing how the points that you make are related
or follow on from each other where appropriate.
Advice
• Read each question carefully before you start to answer it.
•• Check answer
Try to every question.
your answers if you have time at the end.
Turn over
,P78657A
©2025 Pearson Education Ltd.
Y:1/1/1/1/1/
, 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
DO NOT WRITE IN THIS AREA
answer, put a line through the box and then mark your new answer with a cross .
1 A sequence of changes takes place in the body of a mammal after death.
Forensic scientists can use this to help determine the time of death.
(a) State three changes that take place in the body of a mammal in the first 24 hours
after death.
(3)
............................................................................................................................... ............................................................................................................................... ......................
............................................................................................................................... ............................................................................................................................... ......................
............................................................................................................................... ............................................................................................................................... ......................
............................................................................................................................... ............................................................................................................................... ......................
DO NOT WRITE IN THIS AREA
............................................................................................................................... ............................................................................................................................... ......................
............................................................................................................................... ............................................................................................................................... ......................
............................................................................................................................... ............................................................................................................................... ......................
............................................................................................................................... ............................................................................................................................... ......................
............................................................................................................................... ............................................................................................................................... ......................
(b) Insects lay eggs on the body and their larvae feed on the dead tissue.
(i) Which of the following describes the sequence of organisms that colonise a
body after death?
(1)
A bacteria, beetles, flies
B bacteria, flies, beetles DO NOT WRITE IN THIS AREA
C fungi, flies, bacteria
D beetles, flies, fungi
2
, (ii) Explain the effect of an increase in temperature on the rate of decomposition.
(3)
DO NOT WRITE IN THIS AREA
............................................................................................................................... ............................................................................................................................... ......................
............................................................................................................................... ............................................................................................................................... ......................
............................................................................................................................... ............................................................................................................................... ......................
............................................................................................................................... ............................................................................................................................... ......................
............................................................................................................................... ............................................................................................................................... ......................
............................................................................................................................... ............................................................................................................................... ......................
............................................................................................................................... ............................................................................................................................... ......................
............................................................................................................................... ............................................................................................................................... ......................
(Total for Question 1 = 7 marks)
DO NOT WRITE IN THIS AREA
DO NOT WRITE IN THIS AREA
3
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