Mark Scheme (Results)
2025 Predicted Paper
Pearson Edexcel Level 3 GCE
Edexcel AL Biology Marking Scheme 3A 2025 Predicted
PAPER 3 Advanced Level
1
, Edexcel AL Biology Marking Scheme 3A 2025 Predicted
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.
2
,Edexcel AL Biology Marking Scheme 3A 2025 Predicted
3
, Edexcel AL Biology Marking Scheme 3A 2025 Predicted
Comprehensive Marking Scheme
Question 1
(a) Define the term "ecological niche" and explain its importance in
a community. (3 Marks)
Understanding the Question:
• Question Type: Definition + Conceptual Importance.
• Patterns (2015–2023): Typically linked to species roles, biodiversity, or
ecosystem balance.
• Topics Covered: Community ecology, biodiversity, adaptations.
• Approach: Start with a precise, textbook definition. Follow with a clear
explanation of the term's ecological importance, ideally with examples.
Mark Scheme:
1. Definition of ecological niche (1 mark):
o An ecological niche is the role and position a species has in its
environment, including its interactions with biotic and abiotic factors
such as its habitat, resource use, and its contribution to energy flow.
2. Importance in a community (2 marks):
o Allows coexistence of species by reducing competition (niche
differentiation).
o Ensures efficient resource use, maintaining ecological balance and
biodiversity stability.
Explanation for Marks:
• The definition provides a baseline understanding of the term.
• Including its role in reducing competition (e.g., resource partitioning like
nocturnal vs. diurnal feeding) ensures marks for the second part.
4
2025 Predicted Paper
Pearson Edexcel Level 3 GCE
Edexcel AL Biology Marking Scheme 3A 2025 Predicted
PAPER 3 Advanced Level
1
, Edexcel AL Biology Marking Scheme 3A 2025 Predicted
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.
2
,Edexcel AL Biology Marking Scheme 3A 2025 Predicted
3
, Edexcel AL Biology Marking Scheme 3A 2025 Predicted
Comprehensive Marking Scheme
Question 1
(a) Define the term "ecological niche" and explain its importance in
a community. (3 Marks)
Understanding the Question:
• Question Type: Definition + Conceptual Importance.
• Patterns (2015–2023): Typically linked to species roles, biodiversity, or
ecosystem balance.
• Topics Covered: Community ecology, biodiversity, adaptations.
• Approach: Start with a precise, textbook definition. Follow with a clear
explanation of the term's ecological importance, ideally with examples.
Mark Scheme:
1. Definition of ecological niche (1 mark):
o An ecological niche is the role and position a species has in its
environment, including its interactions with biotic and abiotic factors
such as its habitat, resource use, and its contribution to energy flow.
2. Importance in a community (2 marks):
o Allows coexistence of species by reducing competition (niche
differentiation).
o Ensures efficient resource use, maintaining ecological balance and
biodiversity stability.
Explanation for Marks:
• The definition provides a baseline understanding of the term.
• Including its role in reducing competition (e.g., resource partitioning like
nocturnal vs. diurnal feeding) ensures marks for the second part.
4
