Mark Scheme
(Results)
Summer 2024
Pearson Edexcel GCSE
In Biology (1BI0)
Paper 1H
,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 Mark
number
1(a)(i) (1)
C natural selection
AO1 1
The only correct answer is C
A is not correct because genetic engineering is not
involved in the theory of evolution
B is not correct because biological control is not involved
in the theory of evolution
D is not correct because tissue culture is not involved
in the theory of evolution
Question Answer Additional Mark
number guidance
1 (a)(ii) Two from: (2)
• genetics / mutation / accept genes / AO1 1
alleles (1) genetic
modification
ignore DNA
• sexual reproduction /
meiosis (1) accept idea of
different parents /
breeding
ignore inbreeding /
selective breeding
• environment / named
environmental factors accept changes to
e.g. diet, lifestyle, the environment
climate, temperature (1)
ignore adaptations
to environment /
selection pressures
/ / natural
selection / disease
, Question Answer Additional Mark
number guidance
1(a)(iii) Any one from: (1)
• change in the accept {climate / AO1 1
environment weather} change
accept use of
antibiotics / named
chemicals e.g.
pesticides
• competition
• (increase in) predators
accept idea of
• change in {prey / food availability of /
source / resources / decrease in
habitat}
• natural disaster
ignore bacteria /
pathogens / named
pathogens
Question Answer Additional Mark
number guidance
1(b)(i) An answering including two (2)
from:
AO2 1
• (different) mutations
occurred (1)
• selection pressure (1)
accept different
• different {environments weather /
/ climate / habitats / temperature /
ecosystems} (1) conditions
(Results)
Summer 2024
Pearson Edexcel GCSE
In Biology (1BI0)
Paper 1H
,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 Mark
number
1(a)(i) (1)
C natural selection
AO1 1
The only correct answer is C
A is not correct because genetic engineering is not
involved in the theory of evolution
B is not correct because biological control is not involved
in the theory of evolution
D is not correct because tissue culture is not involved
in the theory of evolution
Question Answer Additional Mark
number guidance
1 (a)(ii) Two from: (2)
• genetics / mutation / accept genes / AO1 1
alleles (1) genetic
modification
ignore DNA
• sexual reproduction /
meiosis (1) accept idea of
different parents /
breeding
ignore inbreeding /
selective breeding
• environment / named
environmental factors accept changes to
e.g. diet, lifestyle, the environment
climate, temperature (1)
ignore adaptations
to environment /
selection pressures
/ / natural
selection / disease
, Question Answer Additional Mark
number guidance
1(a)(iii) Any one from: (1)
• change in the accept {climate / AO1 1
environment weather} change
accept use of
antibiotics / named
chemicals e.g.
pesticides
• competition
• (increase in) predators
accept idea of
• change in {prey / food availability of /
source / resources / decrease in
habitat}
• natural disaster
ignore bacteria /
pathogens / named
pathogens
Question Answer Additional Mark
number guidance
1(b)(i) An answering including two (2)
from:
AO2 1
• (different) mutations
occurred (1)
• selection pressure (1)
accept different
• different {environments weather /
/ climate / habitats / temperature /
ecosystems} (1) conditions
