BIOLOGY-B-9BI0 · Pearson Edexcel A Level
BIOLOGY-B-9BI0/11
Paper 1
Biology B · 2024 · Variant 1
Relative difficulty
Analysis source: Pearson Edexcel
Analysis aligned to the official syllabus and assessment design.
4.0 / 5
300
360 min
Respiration Energetics, Aerobic Respiration, and Ecological Data Interpretation
Cohort performance
Session statistics from official examination reports
Total marks
300
Duration
360 min
Session difficulty
4.0 / 5
Key examiner messages
Top priorities from the principal examiner before you revise
A significant proportion of marks in this series was allocated to mathematical application and practical evaluation.
In Paper 1, the 11-mark genetic analysis on mitochondrial DNA and tRNA mutations challenged students to link substitution mutations directly to the tertiary structure and functional role of tRNA.
In Paper 2, the 13-mark question on nervous transmission and inhibitory postsynaptic potentials (IPSP) tested students' precision; many lost marks by failing to use the correct ionic notation (e.g., writing Ca+ \text{Ca}^{+} Ca+ instead of Ca2+ \text{Ca}^{2+} Ca2+).
Paper 3 was heavily focused on Core Practicals, highlighting that a deep understanding of experimental methodologies (such as respirometer setup and plasmolysis calculations) is vital for high-scoring candidates.
Question difficulty map
How candidates performed on each question in this series
No data available in official reports
Assessment objectives
Skill and AO weighting from official examiner commentary
Skill weighting
Shows the skill mix this paper tested most heavily.
Mathematical &
Weight: 7100%Graphs
Weight: 686%Experimental
Weight: 571%Synoptic
Weight: 457%Analysis
Weight: 343%Biological
Weight: 229%Conten
Weight: 114%
Method marks watchlist
Where working, steps, or method marks were commonly lost
No data available in official reports
Recurring mistakes across years
Themes examiners flag in multiple recent sessions for this subject
No data available in official reports
Question choice intelligence
Mean scores and popularity for optional questions (HKDSE electives)
No data available in official reports
Level exemplars
What candidate scripts at each grade level looked like
No data available in official reports
Grade & admission context
How marks relate to grade thresholds and entry standards
Report type
Examiner report — national grade boundaries and question-level commentary
Level A*
Approx. 68% of maximum mark
Level A
Approx. 57% of maximum mark
Level B
Approx. 48% of maximum mark
Level C
Approx. 40% of maximum mark
Level D
Approx. 31% of maximum mark
Level E
Approx. 23% of maximum mark
Deep insights
What top candidates did
Techniques and approaches examiners rewarded in this series
No data available in official reports
Command word playbook
How to match each command word to the expected response style
Give reasons and link mechanism to outcome; each point needs a because/so chain.
State features in sequence or list observable properties — do not explain causes unless asked.
Show formula, substitution, and unit; method marks need visible working.
Break into parts and explain how each contributes to the whole question focus.
Present multiple perspectives with evidence; balance breadth and depth.
Match the expected response style for “Determine” questions.
Time traps
Sections where candidates spent disproportionate time relative to marks
Min per mark: 0.2
Min per mark: 0
Syllabus traceability
Topics linked to questions and mark weighting in this session
Aerobic respiration
29 marks this session
Biodiversity
26 marks this session
Cell transport mechanisms
24 marks this session
MCQ trap analytics
Commonly chosen wrong options from examiner commentary
No data available in official reports
Topic heatmap across years
Mark concentration by topic and exam year for this subject
Mark intensity
Biodiversity
Aerobic respiration
Cell transport mechanisms
Response to infection
Circulation
Photosynthesis
Gas exchange
Microbial techniques
Difficulty trend
How session difficulty has shifted across recent years
Paper comparison
Marks and duration breakdown across papers in this session
Paper 1: Advanced Biochemistry, Microbiology and Genetics:
Paper 2: Advanced Physiology, Evolution and Ecology:
Paper 3: General and Practical Principles in Biology:
Marks you can still earn
Where valid approaches outside the mark scheme may still gain credit
No data available in official reports
Practise what examiners flagged
Target weak topics from this report inside the Revui app
Aerobic respiration
29 marks this session
Practise in RevuiBiodiversity
26 marks this session
Practise in RevuiCell transport mechanisms
24 marks this session
Practise in RevuiSelf-diagnostic checklist
Key actions before you sit this paper — copy and tick off as you revise
- 1Message
A significant proportion of marks in this series was allocated to mathematical application and practical evaluation.
- 2Message
In Paper 1, the 11-mark genetic analysis on mitochondrial DNA and tRNA mutations challenged students to link substitution mutations directly to the tertiary structure and functional role of tRNA.
- 3Message
In Paper 2, the 13-mark question on nervous transmission and inhibitory postsynaptic potentials (IPSP) tested students' precision; many lost marks by failing to use the correct ionic notation (e.g., writing Ca+ \text{Ca}^{+} Ca+ instead of Ca2+ \text{Ca}^{2+} Ca2+).
- 4Message
Paper 3 was heavily focused on Core Practicals, highlighting that a deep understanding of experimental methodologies (such as respirometer setup and plasmolysis calculations) is vital for high-scoring candidates.
Teacher briefing pack
One-page session summary for tutors and classroom review
2024 2024
Biology B
A significant proportion of marks in this series was allocated to mathematical application and practical evaluation. In Paper 1, the 11-mark genetic analysis on mitochondrial DNA and tRNA mutations challenged students to link substitution mutations directly to the tertiary struct
A significant proportion of marks in this series was allocated to mathematical application and practical evaluation.
In Paper 1, the 11-mark genetic analysis on mitochondrial DNA and tRNA mutations challenged students to link substitution mutations directly to the tertiary structure and functional role of tRNA.
In Paper 2, the 13-mark question on nervous transmission and inhibitory postsynaptic potentials (IPSP) tested students' precision; many lost marks by failing to use the correct ionic notation (e.g., writing Ca+ \text{Ca}^{+} Ca+ instead of Ca2+ \text{Ca}^{2+} Ca2+).
- Total marks
- 300
- Duration
- 360 min
- Session difficulty
- 4.0 / 5
Session analysis
A significant proportion of marks in this series was allocated to mathematical application and practical evaluation. In Paper 1, the 11-mark genetic analysis on mitochondrial DNA and tRNA mutations challenged students to link substitution mutations directly to the tertiary structure and functional role of tRNA. In Paper 2, the 13-mark question on nervous transmission and inhibitory postsynaptic potentials (IPSP) tested students' precision; many lost marks by failing to use the correct ionic notation (e.g., writing Ca+ \text{Ca}^{+} Ca+ instead of Ca2+ \text{Ca}^{2+} Ca2+). Paper 3 was heavily focused on Core Practicals, highlighting that a deep understanding of experimental methodologies (such as respirometer setup and plasmolysis calculations) is vital for high-scoring candidates.
Updated Jun 14, 2026
Paper breakdown
Paper 1: Advanced Biochemistry, Microbiology and Genetics:
Paper 2: Advanced Physiology, Evolution and Ecology:
Paper 3: General and Practical Principles in Biology:
Top chapters
Exam structure insights
Marks by chapter
See where the marks were concentrated so revision time goes to the highest-value topics.
Mark accessibility
Estimate which marks were basic, mid-level, or high-difficulty.
73% within easy or medium reach
Command word frequency
Spot common command words so answers match the expected response style.
Question type mix
Compare the mark share of each paper section and question type.
Short Answer
171·64·57%
Extended Open Response / Discuss
55·8·18%
Mathematical / Calculation
30·15·10%
Graphical / Drawing
30·6·10%
Multiple Choice
14·14·5%
Study ROI
Bigger bubbles recur more often; higher bubbles carry more marks, helping you rank revision priorities.
Time vs marks
Compare marks with suggested time allocation to plan exam pacing.
Paper 1 (Advanced B…
180.20 m/minPaper 2 (Advanced P…1
4.02 m/minTotal marks
1102
Total time
55 min
Avg pace
20.04
Next-year prediction
Topics worth watching next year, with the reason shown directly below each bar.
Transport in plants
90%90%
Action of antibiotics
85%85%
Gene pools
80%80%
Examiner notes & key calculations
- Lack of Comparative Terminology: In questions analyzing yeast concentrations and rate graphs, students frequently described individual data points rather than providing comparative evaluations (e.g., using terms like 'faster', 'steeper', or 'plateaus earlier').
- Incorrect Mathematical Standards: Magnification and rate calculation questions explicitly demanded standard form or a specific number of decimal places. Many candidates calculated the correct numeric value but lost marks due to rounding errors or omitting units such as cm3min−1 \text{cm}^3\text{min}^{-1} cm3min−1.
- Vague Statistical Assertions: In both Chi-Squared and Spearman's Rank analysis, candidates often failed to explicitly state whether they rejected or accepted the null hypothesis relative to the critical value at the p=0.05 p = 0.05 p=0.05 significance level.
Analysis is paraphrased for study purposes. Always verify against the official examiner report and mark scheme.