BIOLOGY · HKDSE
BIOLOGY/21
(Elective Part - any 2 of 4 electives)
Biology · 2022 · Variant 1
Relative difficulty
Analysis source: Hong Kong Examinations and Assessment Authority (HKEAA)
Analysis aligned to the official syllabus and assessment design.
3.5 / 5
160
210 min
Experimental inquiry and adaptation in ecology & plant transport
Cohort performance
Session statistics from official examination reports
Total marks
160
Duration
210 min
Session difficulty
3.5 / 5
Level 5**
~83% of max
Level 5*
~77% of max
Level 5
~67% of max
Key examiner messages
Top priorities from the principal examiner before you revise
The 2022 Biology paper returns to a classic style but introduces highly sophisticated experimental scenario analyses. Candidates faced rigorous assessments on experimental design, data interpretation, and precision in biological terminology. While basic recall questions in the MC
Candidates faced rigorous assessments on experimental design, data interpretation, and precision in biological terminology.
While basic recall questions in the MC section provided a solid baseline of marks, conventional questions required a deeper synthesis of ecological interactions, physiology, and modern genetics.
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.
Analysis & I
Weight: 7100%Experimental
Weight: 686%Biological Terminology
Weight: 571%Calculations & Application
Weight: 343%Conceptual
Weight: 229%Recall
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
Reporting source
HKEAA Subject Examination Report — comments on candidates’ performance with marking schemes
Level 5**
Outstanding — competitive JUPAS programmes (medicine, law, top faculties)
Level 5*
Excellent — strong JUPAS profile for selective programmes
Level 5
Good — meets most university entrance requirements
Level 4
Satisfactory — foundation programmes or less selective routes
Level 3
Pass threshold for many sub-degree and vocational pathways
Admission context
Levels feed JUPAS and non-JUPAS university applications; 5** and 5* are most selective
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.
Match the expected response style for “State” questions.
Apply knowledge to an unfamiliar context; concise, practical points score best.
Show formula, substitution, and unit; method marks need visible working.
Time traps
Sections where candidates spent disproportionate time relative to marks
Min per mark: 1.5
Min per mark: 1.5
Min per mark: 0
Syllabus traceability
Topics linked to questions and mark weighting in this session
Biodiversity and evolution
16 marks this session
Essential life processes in plants
15 marks this session
Essential life processes in animals
14 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
Essential life processes in animals
Essential life processes in plants
Biodiversity and evolution
Human impact on the environment
Ecosystems
Cellular energetics
Basic genetics
Molecular genetics
Difficulty trend
How session difficulty has shifted across recent years
Paper comparison
Marks and duration breakdown across papers in this session
Paper 1 (Section A & B):
Paper 2 (Electives):
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
Biodiversity and evolution
16 marks this session
Practise in RevuiEssential life processes in plants
15 marks this session
Practise in RevuiEssential life processes in animals
14 marks this session
Practise in RevuiSelf-diagnostic checklist
Key actions before you sit this paper — copy and tick off as you revise
- 1Message
The 2022 Biology paper returns to a classic style but introduces highly sophisticated experimental scenario analyses. Candidates faced rigorous assessments on experimental design, data interpretation, and precision in biological terminology. While basic recall questions in the MC
- 2Message
Candidates faced rigorous assessments on experimental design, data interpretation, and precision in biological terminology.
- 3Message
While basic recall questions in the MC section provided a solid baseline of marks, conventional questions required a deeper synthesis of ecological interactions, physiology, and modern genetics.
Teacher briefing pack
One-page session summary for tutors and classroom review
2022 2022
Biology
The 2022 Biology paper returns to a classic style but introduces highly sophisticated experimental scenario analyses. Candidates faced rigorous assessments on experimental design, data interpretation, and precision in biological terminology. While basic recall questions in the MC
The 2022 Biology paper returns to a classic style but introduces highly sophisticated experimental scenario analyses. Candidates faced rigorous assessments on experimental design, data interpretation, and precision in biological terminology. While basic recall questions in the MC
Candidates faced rigorous assessments on experimental design, data interpretation, and precision in biological terminology.
While basic recall questions in the MC section provided a solid baseline of marks, conventional questions required a deeper synthesis of ecological interactions, physiology, and modern genetics.
- Total marks
- 160
- Duration
- 210 min
- Session difficulty
- 3.5 / 5
- Level 5**
- ~83% of max
- Level 5*
- ~77% of max
- Level 5
- ~67% of max
Session analysis
The 2022 Biology paper returns to a classic style but introduces highly sophisticated experimental scenario analyses. Candidates faced rigorous assessments on experimental design, data interpretation, and precision in biological terminology. While basic recall questions in the MC section provided a solid baseline of marks, conventional questions required a deeper synthesis of ecological interactions, physiology, and modern genetics.
Updated Jun 11, 2026
Paper breakdown
Paper 1 (Section A & B):
Paper 2 (Electives):
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.
79% 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.
Conventional
(Structured)
112·13·70%
Multiple Choice
36·36·23%
Essay
12·1·8%
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 Section A (…
56.07 m/minPaper 1 Section B (…
0.67 m/minPaper 2 Section A (…
0.67 m/minTotal marks
881
Total time
75 min
Avg pace
11.75
Next-year prediction
Topics worth watching next year, with the reason shown directly below each bar.
Photosynthesis limiting factors & Light-independent reactions
85%85%
Reflex arc, Neurones and Synaptic transmission
80%80%
Executive Difficulty Verdict
The 2022 Biology paper returns to a classic style but introduces highly sophisticated experimental scenario analyses. Candidates faced rigorous assessments on experimental design, data interpretation, and precision in biological terminology. While basic recall questions in the MC section provided a solid baseline of marks, conventional questions required a deeper synthesis of ecological interactions, physiology, and modern genetics.
Examiner notes & key calculations
- Unit Negligence: Many candidates calculated the correct numerical value for cell length but lost the mark because they omitted the unit (μm \mu m μm) or used the wrong symbol.
- Vague Adaptive Explanations: In the root cross-section question, candidates frequently failed to state the specific observable feature of the cells (e.g., 'slender/elongated' for root hairs) before linking it to absorption capacity.
- Molecular Precision: In the antibiotic translation-inhibition question, candidates struggled to detail the exact stage of inhibition, failing to mention that complementary binding blocks the availability of single-stranded mRNA templates for ribosome/tRNA binding.
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.