Pearson
Edexcel
Mark Scheme (Results)
Summer 2025
Pearson Edexcel International GCSE
In Biology (4BI1) Paper 1BR
,Pearson: helping people progress, everywhere
Summer 2025
,General 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 Answer
Number
1(a)(i) A (Mucor is a eukaryotic organism with cell walls
made of chitin)
B is incorrect Mucor does not have cellulose
C is incorrect as Mucor is not a prokaryote
D is incorrect as Mucor is not a prokaryote
Question Answer
Number
1(a)(ii) B (1)
A is incorrect Mucor has cytoplasm
C is incorrect as Mucor does not have chloroplasts or starch
D is incorrect as Mucor does not have chloroplasts or starch
Question Answer Additional guidance
Number
1(a)(iii)
3.14 x 452 = 6358.5
One mark for answer between
to two sig figs = 6400 (2) 6358 and 6362 that is not to
two sig figs
Correct answer gains both
marks
Edexcel
Mark Scheme (Results)
Summer 2025
Pearson Edexcel International GCSE
In Biology (4BI1) Paper 1BR
,Pearson: helping people progress, everywhere
Summer 2025
,General 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 Answer
Number
1(a)(i) A (Mucor is a eukaryotic organism with cell walls
made of chitin)
B is incorrect Mucor does not have cellulose
C is incorrect as Mucor is not a prokaryote
D is incorrect as Mucor is not a prokaryote
Question Answer
Number
1(a)(ii) B (1)
A is incorrect Mucor has cytoplasm
C is incorrect as Mucor does not have chloroplasts or starch
D is incorrect as Mucor does not have chloroplasts or starch
Question Answer Additional guidance
Number
1(a)(iii)
3.14 x 452 = 6358.5
One mark for answer between
to two sig figs = 6400 (2) 6358 and 6362 that is not to
two sig figs
Correct answer gains both
marks
