0610 · Cambridge IGCSE
0610/61
(Alternative to Practical)
Biology · June 2023 · Variant 1
Relative difficulty
Analysis source: Cambridge Assessment International Education
Analysis aligned to the official syllabus and assessment design.
3.4 / 5
160
195 min
Respiration and Osmosis/Water potential
Cohort performance
Session statistics from official examination reports
Total marks
160
Duration
195 min
Session difficulty
3.4 / 5
Key examiner messages
Top priorities from the principal examiner before you revise
Candidates routinely lost marks due to precision errors and sloppy technical terminology.
In Paper 41, the 16-mark question on osmosis and active transport was a major discriminator.
Many failed to use the term water potential correctly, often referring vaguely to 'concentration of water'.
In Paper 51, simple errors like measuring the student's own drawing instead of the official line PQ cost valuable calculation marks.
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 witAO2
Weight: 3100%Handling infoAO3
Weight: 267%Experimental
Weight: 133%
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
Cambridge Principal Examiner Report — component performance and international standards
Level A*
Approx. 83% of maximum mark
Level A
Approx. 69% of maximum mark
Level B
Approx. 55% of maximum mark
Level C
Approx. 41% of maximum mark
Level D
Approx. 35% of maximum mark
Level E
Approx. 29% 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
Match the expected response style for “Name” questions.
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.
Apply knowledge to an unfamiliar context; concise, practical points score best.
Match the expected response style for “Plot” questions.
Time traps
Sections where candidates spent disproportionate time relative to marks
Min per mark: 1.9
Min per mark: 1.9
Min per mark: 1
Min per mark: 0.9
Syllabus traceability
Topics linked to questions and mark weighting in this session
Respiration
29 marks this session
Osmosis
24 marks this session
Gas exchange in humans
15 marks this session
Photosynthesis
13 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
Osmosis
Respiration
Enzymes
Biological molecules
Circulatory systems
Diffusion
Diseases and immunity
Excretion in humans
Difficulty trend
How session difficulty has shifted across recent years
Paper comparison
Marks and duration breakdown across papers in this session
Paper 21 (Extended MCQ):
Paper 41 (Extended Theory):
Paper 51 (Practical Test):
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
Respiration
29 marks this session
Practise in RevuiOsmosis
24 marks this session
Practise in RevuiGas exchange in humans
15 marks this session
Practise in RevuiPhotosynthesis
13 marks this session
Practise in RevuiSelf-diagnostic checklist
Key actions before you sit this paper — copy and tick off as you revise
- 1Message
Candidates routinely lost marks due to precision errors and sloppy technical terminology.
- 2Message
In Paper 41, the 16-mark question on osmosis and active transport was a major discriminator.
- 3Message
Many failed to use the term water potential correctly, often referring vaguely to 'concentration of water'.
- 4Message
In Paper 51, simple errors like measuring the student's own drawing instead of the official line PQ cost valuable calculation marks.
Teacher briefing pack
One-page session summary for tutors and classroom review
June 2023 2023
Biology
Candidates routinely lost marks due to precision errors and sloppy technical terminology. In Paper 41, the 16-mark question on osmosis and active transport was a major discriminator. Many failed to use the term water potential correctly, often referring vaguely to 'concentration
Candidates routinely lost marks due to precision errors and sloppy technical terminology.
In Paper 41, the 16-mark question on osmosis and active transport was a major discriminator.
Many failed to use the term water potential correctly, often referring vaguely to 'concentration of water'.
- Total marks
- 160
- Duration
- 195 min
- Session difficulty
- 3.4 / 5
Session analysis
Candidates routinely lost marks due to precision errors and sloppy technical terminology. In Paper 41, the 16-mark question on osmosis and active transport was a major discriminator. Many failed to use the term water potential correctly, often referring vaguely to 'concentration of water'. In Paper 51, simple errors like measuring the student's own drawing instead of the official line PQ cost valuable calculation marks. Furthermore, unit conversions—such as changing meters to millimetres—tripped up a significant proportion of candidates.
Updated Jun 13, 2026
Paper breakdown
Paper 21 (Extended MCQ):
Paper 41 (Extended Theory):
Paper 51 (Practical Test):
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.
Structured Theory
80·6·50%
Multiple Choice
40·40·25%
Practical Investigation
40·2·25%
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 21 MCQs
1.10 m/minPaper 41 Structured…
1.03 m/minPaper 41 Structured…
0.53 m/minPaper 51 Practical …
0.54 m/minTotal marks
120
Total time
150 min
Avg pace
0.80
Next-year prediction
Topics worth watching next year, with the reason shown directly below each bar.
Homeostasis & Skin Vasoconstriction
85%85%
Coordination & Reflex Arc / Sense Organs
82%82%
Eutrophication and Nitrogen Cycles
78%78%
Examiner notes & key calculations
- Complementarity without 'Shape': When discussing enzyme specificity or neurotransmitter receptors, candidates must explicitly state that the shape of the active site/receptor is complementary to the substrate/neurotransmitter. Simply stating 'they are complementary' is insufficient.
- Water vs. Water Vapour: In plant transport questions, candidates frequently state that 'water' diffuses through the stomata, rather than the scientifically accurate water vapour.
- Data Description vs. Explanation: When asked to 'describe and explain', students often write exhaustive list-style descriptions of graph trends but fail to provide the underlying biological mechanism (e.g., kinetic energy increases, leading to more frequent collisions).
- Floating Units: Placing units inside the data cells of a table instead of exclusively in the column headers remains a common reason for dropping easy marks on Paper 51/61.
Exam tips
Paper format
- Duration
- 1h
- Total marks
- 40
Analysis is paraphrased for study purposes. Always verify against the official examiner report and mark scheme.