2025 Pearson Edexcel AS Level GCE In Biology A Salters – Nuffield (8BN0) Paper 02: Development, Plants, and the Environment QUESTION PAPER AND MARKING SCHEME (MERGED)

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Pearson Edexcel Level 3 GCE
Thursday 22 May 2025
reference 8BN0/02
Biology A (Salters Nuffield)
Subsidiary



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.

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.
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 your answers if you have time at the end.
Turn over

, 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
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


(Source: © Omikron/SCIENCE PHOTO LIBRARY)

magnification ×44000

(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)

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(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
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, (b) The image shows an electronmicrograph of part of a eukaryotic cell.


E




F




G



(Source: © Don Fawcett/SCIENCE PHOTO LIBRARY)


(i) Which row in the table identifies structures E, F and G?
(1)



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)



A photosynthesis mitosis
B photosynthesis protein synthesis
C respiration mitosis
D respiration photosynthesis

(Total for Question 1 = 6 marks)




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, 2 The photograph shows a Pyrenean desman, a mammal that is endemic to
fast‑flowing mountain streams in Spain.




(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
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.

(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




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