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 22 May 2025
Morning (Time: 1 hour 30 minutes) Paper
reference 8BN0/02
Biology A (Salters Nuffield) 🟐 🟐
Advanced Subsidiary
PAPER 2: Development, Plants and the Environment
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.
Show your working in any calculation questions and include units in your answer
where appropriate.
• 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.
• You may use a scientific calculator.
• Instructure
questions 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 on from each other where appropriate.
Advice
• Read each question carefully before you start to answer it.
•• Try to answer every question.
Check your answers if you have time at the end.
EDEXCEL AS LEVEL BIOLOGY A QUESTION PAPER 2 AND MARK SCHEME
(SALTERS NUFFIELD) SUMMER 2025
, 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 All living organisms are made of cells.
(a) The image shows an electronmicrograph of an organelle found only in
eukaryotic cells.
A
B
DO NOT WRITE IN THIS AREA
(Source: © Omikron/SCIENCE PHOTO LIBRARY)
magnification ×44 000
(i) This organelle is not found in prokaryotic cells.
Explain why this type of organelle is present only in eukaryotic cells and not
in prokaryotic cells.
(2)
. .. .. ... .. .. ... .. ... .. .. ... .. .. ... .. .. ... .. ... .. .. ... .. .. ... .. .. ... .. .. .. .. ... .. .. ... .. ... .. .. ... .. .. ... .. .. ... .. ... .. .. ... .. .. .. ... .. .. .. ... .. .. ... .. ... .. .. ... .. .. ... .. .. ... .. ... .. .. ... .. .. ... .. .. ... .. .. .. .. ... .. .. ... .. ... .. .. ... .. .. ... .. .. ... .. ... .. . . . ......................
. .. .. ... .. .. ... .. ... .. .. ... .. .. ... .. .. ... .. ... .. .. ... .. .. ... .. .. ... .. .. .. .. ... .. .. ... .. ... .. .. ... .. .. ... .. .. ... .. ... .. .. ... .. .. .. ... .. .. .. ... .. .. ... .. ... .. .. ... .. .. ... .. .. ... .. ... .. .. ... .. .. ... .. .. ... .. .. .. .. ... .. .. ... .. ... .. .. ... .. .. ... .. .. ... .. ... .. . . . ......................
. .. .. ... .. .. ... .. ... .. .. ... .. .. ... .. .. ... .. ... .. .. ... .. .. ... .. .. ... .. .. .. .. ... .. .. ... .. ... .. .. ... .. .. ... .. .. ... .. ... .. .. ... .. .. .. ... .. .. .. ... .. .. ... .. ... .. .. ... .. .. ... .. .. ... .. ... .. .. ... .. .. ... .. .. ... .. .. .. .. ... .. .. ... .. ... .. .. ... .. .. ... .. .. ... .. ... .. . . . ......................
. .. .. ... .. .. ... . . ... .. .. ... .. .. ... .. .. ... .. ... .. .. ... .. .. ... .. .. ... .. .. .. .. ... .. .. ... .. ... .. .. ... .. .. ... .. .. ... .. ... .. .. ... .. .. .. ... .. .. .. ... .. .. ... .. ... .. .. ... .. .. ... .. .. ... .. ... .. .. ... .. .. ... .. .. ... .. .. .. .. ... .. .. ... .. ... .. .. ... .. .. ... .. .. ... .. ... .. . . . ......................
DO NOT WRITE IN THIS AREA
. .. .. ... .. .. ... .. ... .. .. ... .. .. ... .. .. ... .. ... .. .. ... .. .. ... .. .. ... .. .. .. .. ... .. .. ... .. ... .. .. ... .. .. ... .. .. ... .. ... .. .. ... .. .. .. ... .. .. .. ... .. .. ... .. ... .. .. ... .. .. ... .. .. ... .. ... .. .. ... .. .. ... .. .. ... .. .. .. .. ... .. .. ... .. ... .. .. ... .. .. ... .. .. ... .. ... .. . . . ......................
(ii) Calculate the width of this organelle from A to B, as shown in the image.
Give your answer in micrometres (µm) to two significant figures.
(2)
. .............................................................. µm
2
■■■■
, (b) The image shows an electronmicrograph of part of a eukaryotic cell.
E
DO NOT WRITE IN THIS AREA
F
G
(Source: © Don Fawcett/SCIENCE PHOTO LIBRARY)
DO NOT WRITE IN THIS AREA
(i) Which row in the table identifies structures E, F and G?
(1)
Structure E Structure F Structure G
A chloroplast centriole nucleus
B chloroplast Golgi apparatus nuclear membrane
C mitochondrion centriole nuclear membrane
D mitochondrion Golgi apparatus nucleus
(ii) Which row of the table shows the processes that involve structures E and F?
(1)
DO NOT WRITE IN THIS AREA
Structure E Structure F
A photosynthesis mitosis
B photosynthesis protein synthesis
C respiration mitosis
D respiration photosynthesis
(Total for Question 1 = 6 marks)
3
■■■■ Turn over
, 2 The photograph shows a Pyrenean desman, a mammal that is endemic to
fast‑flowing mountain streams in Spain.
DO NOT WRITE IN THIS AREA
(Source: © BIOSPHOTO/Alamy Stock Photo)
(a) Which of the following is the correct definition of the term endemic?
(1)
A found in only one type of habitat
DO NOT WRITE IN THIS AREA
B found in only one geographical location
C lives in many different locations
D occupies a single niche
(b) The Pyrenean desman has a number of adaptations that allow it to survive in
its habitat:
1. it feeds on insects
2. it has webbed feet to enable it to swim
3. it has a long snout that it can use to find food in between rocks
4. it has nostrils on the upper surface of the snout
5. it is nocturnal – feeding at night. DO NOT WRITE IN THIS AREA
(i) Which adaptations from the list are all anatomical adaptations?
(1)
A 1, 2 and 3
B 1, 3 and 4
C 2, 3 and 4
D 3, 4 and 5
4
■■■■
Candidate surname Other names
Centre Number Candidate Number
Pearson Edexcel Level 3 GCE
Thursday 22 May 2025
Morning (Time: 1 hour 30 minutes) Paper
reference 8BN0/02
Biology A (Salters Nuffield) 🟐 🟐
Advanced Subsidiary
PAPER 2: Development, Plants and the Environment
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.
Show your working in any calculation questions and include units in your answer
where appropriate.
• 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.
• You may use a scientific calculator.
• Instructure
questions 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 on from each other where appropriate.
Advice
• Read each question carefully before you start to answer it.
•• Try to answer every question.
Check your answers if you have time at the end.
EDEXCEL AS LEVEL BIOLOGY A QUESTION PAPER 2 AND MARK SCHEME
(SALTERS NUFFIELD) SUMMER 2025
, 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 All living organisms are made of cells.
(a) The image shows an electronmicrograph of an organelle found only in
eukaryotic cells.
A
B
DO NOT WRITE IN THIS AREA
(Source: © Omikron/SCIENCE PHOTO LIBRARY)
magnification ×44 000
(i) This organelle is not found in prokaryotic cells.
Explain why this type of organelle is present only in eukaryotic cells and not
in prokaryotic cells.
(2)
. .. .. ... .. .. ... .. ... .. .. ... .. .. ... .. .. ... .. ... .. .. ... .. .. ... .. .. ... .. .. .. .. ... .. .. ... .. ... .. .. ... .. .. ... .. .. ... .. ... .. .. ... .. .. .. ... .. .. .. ... .. .. ... .. ... .. .. ... .. .. ... .. .. ... .. ... .. .. ... .. .. ... .. .. ... .. .. .. .. ... .. .. ... .. ... .. .. ... .. .. ... .. .. ... .. ... .. . . . ......................
. .. .. ... .. .. ... .. ... .. .. ... .. .. ... .. .. ... .. ... .. .. ... .. .. ... .. .. ... .. .. .. .. ... .. .. ... .. ... .. .. ... .. .. ... .. .. ... .. ... .. .. ... .. .. .. ... .. .. .. ... .. .. ... .. ... .. .. ... .. .. ... .. .. ... .. ... .. .. ... .. .. ... .. .. ... .. .. .. .. ... .. .. ... .. ... .. .. ... .. .. ... .. .. ... .. ... .. . . . ......................
. .. .. ... .. .. ... .. ... .. .. ... .. .. ... .. .. ... .. ... .. .. ... .. .. ... .. .. ... .. .. .. .. ... .. .. ... .. ... .. .. ... .. .. ... .. .. ... .. ... .. .. ... .. .. .. ... .. .. .. ... .. .. ... .. ... .. .. ... .. .. ... .. .. ... .. ... .. .. ... .. .. ... .. .. ... .. .. .. .. ... .. .. ... .. ... .. .. ... .. .. ... .. .. ... .. ... .. . . . ......................
. .. .. ... .. .. ... . . ... .. .. ... .. .. ... .. .. ... .. ... .. .. ... .. .. ... .. .. ... .. .. .. .. ... .. .. ... .. ... .. .. ... .. .. ... .. .. ... .. ... .. .. ... .. .. .. ... .. .. .. ... .. .. ... .. ... .. .. ... .. .. ... .. .. ... .. ... .. .. ... .. .. ... .. .. ... .. .. .. .. ... .. .. ... .. ... .. .. ... .. .. ... .. .. ... .. ... .. . . . ......................
DO NOT WRITE IN THIS AREA
. .. .. ... .. .. ... .. ... .. .. ... .. .. ... .. .. ... .. ... .. .. ... .. .. ... .. .. ... .. .. .. .. ... .. .. ... .. ... .. .. ... .. .. ... .. .. ... .. ... .. .. ... .. .. .. ... .. .. .. ... .. .. ... .. ... .. .. ... .. .. ... .. .. ... .. ... .. .. ... .. .. ... .. .. ... .. .. .. .. ... .. .. ... .. ... .. .. ... .. .. ... .. .. ... .. ... .. . . . ......................
(ii) Calculate the width of this organelle from A to B, as shown in the image.
Give your answer in micrometres (µm) to two significant figures.
(2)
. .............................................................. µm
2
■■■■
, (b) The image shows an electronmicrograph of part of a eukaryotic cell.
E
DO NOT WRITE IN THIS AREA
F
G
(Source: © Don Fawcett/SCIENCE PHOTO LIBRARY)
DO NOT WRITE IN THIS AREA
(i) Which row in the table identifies structures E, F and G?
(1)
Structure E Structure F Structure G
A chloroplast centriole nucleus
B chloroplast Golgi apparatus nuclear membrane
C mitochondrion centriole nuclear membrane
D mitochondrion Golgi apparatus nucleus
(ii) Which row of the table shows the processes that involve structures E and F?
(1)
DO NOT WRITE IN THIS AREA
Structure E Structure F
A photosynthesis mitosis
B photosynthesis protein synthesis
C respiration mitosis
D respiration photosynthesis
(Total for Question 1 = 6 marks)
3
■■■■ Turn over
, 2 The photograph shows a Pyrenean desman, a mammal that is endemic to
fast‑flowing mountain streams in Spain.
DO NOT WRITE IN THIS AREA
(Source: © BIOSPHOTO/Alamy Stock Photo)
(a) Which of the following is the correct definition of the term endemic?
(1)
A found in only one type of habitat
DO NOT WRITE IN THIS AREA
B found in only one geographical location
C lives in many different locations
D occupies a single niche
(b) The Pyrenean desman has a number of adaptations that allow it to survive in
its habitat:
1. it feeds on insects
2. it has webbed feet to enable it to swim
3. it has a long snout that it can use to find food in between rocks
4. it has nostrils on the upper surface of the snout
5. it is nocturnal – feeding at night. DO NOT WRITE IN THIS AREA
(i) Which adaptations from the list are all anatomical adaptations?
(1)
A 1, 2 and 3
B 1, 3 and 4
C 2, 3 and 4
D 3, 4 and 5
4
■■■■
