Mark Scheme (Results)
Summer 2023
Pearson Edexcel GCE
In Biology B (8BI0)
Paper 02: Core Physiology and EcologyEdexcel and BTEC
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Summer 2023
Question Paper Log Number P71925A
Publications Code 8BI0_02_2306_MS
All the material in this publication is copyright
© Pearson Education Ltd 2023General Marking Guidance
• All candidates must receive the same
treatment. Examiners must mark the first candidate in
exactly the same way as they mark the last.
• Mark schemes should be applied positively. Candidates
must be rewarded for what they have shown they can do
rather than penalised for omissions.
• Examiners should mark according to the mark scheme
not according to their perception of where the grade
boundaries may lie.
• There is no ceiling on achievement. All marks on the mark
scheme should be used appropriately.
• All the marks on the mark scheme are designed to be
awarded. Examiners should always award full marks if
deserved, i.e. if the answer matches the mark
scheme. Examiners should also be prepared to award
zero marks if the candidate’s response is not worthy of
credit according to the mark scheme.
• Where some judgement is required, mark schemes will
provide the principles by which marks will be awarded
and exemplification may be limited.
• When examiners are in doubt regarding the application
of the mark scheme to a candidate’s response, the team
leader must be consulted.
• Crossed out work should be marked UNLESS the
candidate has replaced it with an alternative response.Question
Number
Answer Mark
1(a) The only correct answer is D all statements are correct
A is not correct because statement 3 and 4 are true
B is not correct because statement 4 is true
C is not correct because statement 3 is true
(1)
Question
Number
Answer additional
guidance
Mark
1(b) An explanation that includes the following points:
• larger organisms have smaller SA/ Vol ratio (1)
• some cells far from surface (1)
• so diffusion alone cannot supply deliver / transport (oxygen / glucose / nutrients
to cells) (1)
allow converse (3)Question
Number
Answer Additional guidance Mark
1(c) An answer that makes reference to the following points
Similarities
• both have structures that increase surface area (1)
• both have a short diffusion distance (1)
• both have surfaces that allow oxygen and carbon
dioxide to dissolve (1)
Differences up to three from
• fish live in aquatic environment so do not need to keep
surfaces moist / insect air sacs are moist (1)
• in insects gases delivered to / removed from cells
directly but fish use circulation (1)
• fish have gills / lamellae / filaments whilst insects have
tracheae/ tracheoles / spiracles (1)
• fish have counter current flow (1)
At least one similarity and one difference
some insects pump air into and out of
trachea some have air sacs which store
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