Mark Scheme (Results)
2025 Predicted Paper
Pearson Edexcel Level 3 GCE
Edexcel AL Biology Marking Scheme 1A 2025 Predicted
PAPER 1 Advanced Level
1
, Edexcel AL Biology Marking Scheme 1A 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 1A 2025 Predicted
3
, Edexcel AL Biology Marking Scheme 1A 2025 Predicted
Comprehensive Marking Scheme
Question 1
(a) (i)
Context & Analysis:
This type of question, common in ecology and ecosystems topics, evaluates the
understanding of energy flow through ecosystems, specifically primary productivity.
It has appeared in various forms from 2015-2023, often in questions about energy
transfer, food chains, and ecosystems. The calculations focus on applying formulas
such as NPP=GPP−Respiration, with emphasis on correct substitution and units.
How to Approach:
1. Identify the given values (GPP and respiration).
2. Use the correct formula.
3. Show all steps of the calculation and include units.
Theory to Master:
• Energy flow in ecosystems.
• Definitions and distinctions between GPP, NPP, and respiration.
Answer:
NPP=GPP−Respiration
Marks:
• 1 mark for the correct formula and substitution.
• 1 mark for the correct final answer with units.
4
2025 Predicted Paper
Pearson Edexcel Level 3 GCE
Edexcel AL Biology Marking Scheme 1A 2025 Predicted
PAPER 1 Advanced Level
1
, Edexcel AL Biology Marking Scheme 1A 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 1A 2025 Predicted
3
, Edexcel AL Biology Marking Scheme 1A 2025 Predicted
Comprehensive Marking Scheme
Question 1
(a) (i)
Context & Analysis:
This type of question, common in ecology and ecosystems topics, evaluates the
understanding of energy flow through ecosystems, specifically primary productivity.
It has appeared in various forms from 2015-2023, often in questions about energy
transfer, food chains, and ecosystems. The calculations focus on applying formulas
such as NPP=GPP−Respiration, with emphasis on correct substitution and units.
How to Approach:
1. Identify the given values (GPP and respiration).
2. Use the correct formula.
3. Show all steps of the calculation and include units.
Theory to Master:
• Energy flow in ecosystems.
• Definitions and distinctions between GPP, NPP, and respiration.
Answer:
NPP=GPP−Respiration
Marks:
• 1 mark for the correct formula and substitution.
• 1 mark for the correct final answer with units.
4
