BIOLOGY · Pearson Edexcel IGCSE
BIOLOGY/21
B / 2BR (Advanced Biology)
Biology · 2024 · Variant 1
Relative difficulty
Analysis source: Pearson Edexcel
Analysis aligned to the official syllabus and assessment design.
3.4 / 5
180
195 min
Plant Nutrition and Human Physiology/Reproduction
Cohort performance
Session statistics from official examination reports
Total marks
180
Duration
195 min
Session difficulty
3.4 / 5
Key examiner messages
Top priorities from the principal examiner before you revise
This series sits firmly at a moderate-to-high difficulty level.
While Paper 1B provided accessible entry points with food webs and basic flower anatomy, it scaled rapidly into high-tariff data evaluation questions.
Paper 2B maintained a high demand for critical thinking, especially within the context of the extinction passage and the evaluation of GM fish farming.
Students who relied purely on rote memorisation struggled with the highly applied context-based questions.
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.
Knowledge
Weight: 5100%Recall
Weight: 480%Application and Calculation
Weight: 360%Experimental
Weight: 240%Mathematical & Calculation
Weight: 120%
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
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.
Match the expected response style for “State” questions.
Weigh arguments for and against with evidence; end with a supported judgement.
Apply knowledge to an unfamiliar context; concise, practical points score best.
Present multiple perspectives with evidence; balance breadth and depth.
Time traps
Sections where candidates spent disproportionate time relative to marks
Min per mark: 1.1
Syllabus traceability
Topics linked to questions and mark weighting in this session
Nutrition (Structure and functions in living organisms)
25 marks this session
Reproduction (Reproduction and inheritance)
24 marks this session
Transport (Structure and functions in living organisms)
23 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
Reproduction
Nutrition (Structure and functions in living organisms)
The organism in the environment
Reproduction (Reproduction and inheritance)
Transport
Transport (Structure and functions in living organisms)
Inheritance
Biological molecules
Paper comparison
Marks and duration breakdown across papers in this session
Paper 1B:
Paper 2B:
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
Nutrition (Structure and functions in living organisms)
25 marks this session
Practise in RevuiReproduction (Reproduction and inheritance)
24 marks this session
Practise in RevuiTransport (Structure and functions in living organisms)
23 marks this session
Practise in RevuiSelf-diagnostic checklist
Key actions before you sit this paper — copy and tick off as you revise
- 1Message
This series sits firmly at a moderate-to-high difficulty level.
- 2Message
While Paper 1B provided accessible entry points with food webs and basic flower anatomy, it scaled rapidly into high-tariff data evaluation questions.
- 3Message
Paper 2B maintained a high demand for critical thinking, especially within the context of the extinction passage and the evaluation of GM fish farming.
- 4Message
Students who relied purely on rote memorisation struggled with the highly applied context-based questions.
Teacher briefing pack
One-page session summary for tutors and classroom review
2024 2024
Biology
This series sits firmly at a moderate-to-high difficulty level. While Paper 1B provided accessible entry points with food webs and basic flower anatomy, it scaled rapidly into high-tariff data evaluation questions. Paper 2B maintained a high demand for critical thinking, especial
This series sits firmly at a moderate-to-high difficulty level.
While Paper 1B provided accessible entry points with food webs and basic flower anatomy, it scaled rapidly into high-tariff data evaluation questions.
Paper 2B maintained a high demand for critical thinking, especially within the context of the extinction passage and the evaluation of GM fish farming.
- Total marks
- 180
- Duration
- 195 min
- Session difficulty
- 3.4 / 5
Session analysis
This series sits firmly at a moderate-to-high difficulty level. While Paper 1B provided accessible entry points with food webs and basic flower anatomy, it scaled rapidly into high-tariff data evaluation questions. Paper 2B maintained a high demand for critical thinking, especially within the context of the extinction passage and the evaluation of GM fish farming. Students who relied purely on rote memorisation struggled with the highly applied context-based questions.
Updated Jun 13, 2026
Paper breakdown
Paper 1B:
Paper 2B:
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.
78% 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
90·42·50%
Structured Explanation
56·12·31%
Extended Response
24·4·13%
Multiple Choice
10·10·6%
Study ROI
Bigger bubbles recur more often; higher bubbles carry more marks, helping you rank revision priorities.
Difficulty trend
Compare difficulty across recent years.
Time vs marks
Compare marks with suggested time allocation to plan exam pacing.
Paper 2B (Extension
0.93 m/minTotal marks
70
Total time
75 min
Avg pace
0.93
Next-year prediction
Topics worth watching next year, with the reason shown directly below each bar.
Gas Exchange & Smoking
90%90%
Cycles within Ecosystems
85%85%
Enzyme Kinetics and Food Tests
80%80%
Overall Difficulty Verdict
This series sits firmly at a moderate-to-high difficulty level. While Paper 1B provided accessible entry points with food webs and basic flower anatomy, it scaled rapidly into high-tariff data evaluation questions. Paper 2B maintained a high demand for critical thinking, especially within the context of the extinction passage and the evaluation of GM fish farming. Students who relied purely on rote memorisation struggled with the highly applied context-based questions.
Exam tips
Paper format
- Duration
- 1h 15min
- Total marks
- 70
- Weighting
- 38.9%
- Question types
- Comprehension Passage, Structured and Short Answer, Practical / Experimental Design, Mathematical / Calculation
Analysis is paraphrased for study purposes. Always verify against the official examiner report and mark scheme.