Cambridge IAS-Level · Analysis & Prediction

2026 Cambridge IAS-Level Biology (9700) Past Paper: Analysis & Answers

The May/June 2026 AS Level series across Paper 14 (MCQ), Paper 24 (Theory), and Paper 34 (Practical) presents a well-balanced assessment heavily weighting core practical technique, plant transport anatomy, and enzyme kinetics. Paper 24 places substantial emphasis on graphical interpretation (Vmax/Km curves, pH profiles, and oxygen dissociation curves) alongside detailed comparative histology. Paper 34 integrates quantitative membrane leakage and dye uptake investigations with plan and high-power plant anatomy drawings. High-scoring candidates demonstrated precise terminology, accurate calculation of actual dimensions, and sharp biological drawing standards.

Updated: 23 Sept 2026

Analysis Sample paper

Difficulty 3.4/5

Total marks

140

Duration

270 mins

Most tested

Transport in plants (Anatomy and Mechanisms)

Paper breakdown

Paper 14 (Multiple Choice): 40 marks · 75 minsPaper 24 (AS Level Structured Questions): 60 marks · 75 minsPaper 34 (Advanced Practical Skills 2): 40 marks · 120 mins

Top chapters

Transport in plants · 35 marksCell membranes and transport · 24 marksEnzymes · 17 marks

Overall Verdict & Difficulty

The May/June 2026 AS series for Biology (9700) represents a balanced yet technically demanding paper suite (Difficulty 3.4/5). While standard recall questions across cell structure and biological molecules offer accessible entry marks, higher-tier marks hinge heavily on data interpretation, experimental error analysis, and structural comparisons between monocotyledonous and dicotyledonous tissues.

Where the Marks Lie

Marks are concentrated in three key syllabus domains: Transport in plants, Cell membranes and transport, and Enzymes.

Paper 14 (MCQ): Tests comprehensive syllabus breadth with nuanced application items covering organelle tracking, competitive inhibition graphs, and fluid mosaic membrane dynamics.
Paper 24 (Theory): Dominant mark areas include Question 2 (Enzymes & M. tuberculosis pathogenesis, 12 marks), Question 3 (Infectious disease epidemiology & bacterial genetics, 11 marks), and Question 5 (Plant root anatomy & suberin pathways, 9 marks).
Paper 34 (Practical): Features membrane permeability via methylene blue leakage across temperatures (19 marks) paired with microscopical stem plan and cellular drawing (21 marks).

Examiner Pitfalls & Common Errors

Examiners routinely penalized vague descriptions and sloppy technical execution:

Microscopy & Drawing: Failure to draw continuous, unshaded lines or incorrectly showing individual cells in low-power plan diagrams. When drawing xylem elements, failing to clearly show double walls or correct cell junctions.
Calculations & Significant Figures: Omitting units or failing to quote answers to 3 significant figures when calculating areas (e.g. \(\text{Area} = \pi r^2\)).
Data Extraction & Graphing: Misreading axes on saturation curves or neglecting to label full axis quantities and units with regular scale intervals.
Terminology: Confusing facilitated diffusion with active transport, or misidentifying the Casparian strip / endodermal role in forcing symplastic water movement.

Revision & Exam Strategy

Candidates preparing for upcoming series should focus on mastering Michaelis-Menten kinetic derivations (\(V_{\max}\) and \(K_m\)), constructing neat three-column comparative anatomical tables, and practising precise magnification calculations (\(\text{Actual} = \frac{\text{Image}}{\text{Magnification}}\)).

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Charts

Marks by chapter

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Question type mix

Compare the mark share of each paper section and question type.

Multiple Choice40 marks · 40 questions
Short Answer & Recall19 marks · 12 questions
Data Analysis & Graphical Interpretation18 marks · 7 questions
Structured Explanation & Suggestion23 marks · 8 questions
Practical Investigation & Microscopy Drawing40 marks · 8 questions

Mark accessibility

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79%within easy or medium reach

easy: 48 marksmedium: 62 markshard: 30 marks

Difficulty trend

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Command word frequency

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Skill weighting

Shows the skill mix this paper tested most heavily.

Study ROI

Higher bubbles carry more marks; bubbles further left are easier. Start with the topics that sit high and to the left.

Transport in plants

35 marks · Difficulty 3.2

Cell membranes & Practical Transport

24 marks · Difficulty 3.1

Enzymes & Kinetics

17 marks · Difficulty 3

Biological Molecules & Bonding

16 marks · Difficulty 2.5

Infectious Diseases & Prevention

14 marks · Difficulty 2.8

The Mitotic Cell Cycle

11 marks · Difficulty 2.9

Time vs marks

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marksmins

Next-year prediction

Topics worth watching next year, and why. These are informed guesses from past papers, not a forecast.

Nucleic acids and protein synthesis

Lightly represented in Paper 24 of this series (mostly confined to gene definitions and MCQ); historically carries 10-15 marks on AS theory papers.

The immune system and monoclonal antibodies

Immunity was split across small subparts in Paper 24 Question 6 and MCQ without a full structured question on phagocytosis or monoclonal antibody production.

Gas exchange system histology and smoking pathology

Only touched upon via mucin/goblet cells and oxygen dissociation; full cross-sectional tracheal histology and emphysema questions are highly likely next series.

Cumulative marks ladder

The line is your running mark total question by question; dashed lines are the estimated grade boundaries, taken from the table below when this year's are known. See which question the line crosses your target grade at, so you know how far you must answer cleanly and which questions decide a band.

Topic-year heatmap

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Transport in plants

Cell structure

Factors that affect enzyme action

Enzymes

Structure of transport tissues

Biological molecules

Cell membranes and transport

Transport in mammals

Testing for biological molecules

The mitotic cell cycle

Examiner insights

Official report

Common pitfalls

Failing to draw an appropriate plateau at exactly 580 U/cm3 and pass through Km at 0.15 mmol/dm3 when sketching enzyme curves.
Including individual cells inside low-power plan diagrams instead of drawing clean tissue layer boundaries only.
Confusing the role of suberin in the endodermal Casparian strip by stating it blocks the symplast pathway rather than blocking the apoplast pathway.
Quoting calculation answers to incorrect significant figures or forgetting intermediate working units during microscope area calculations.

Misconceptions

Believing lipids are polymers rather than merely macromolecules consisting of non-repeating distinct subunits (glycerol and fatty acids).
Assuming all cell division in photomicrographs must be plant cells without checking for cell walls, cell plates, or cleavage furrows.
Assuming high Case Fatality Rate (CFR) directly correlates with total case volume rather than health system quality, access to oral rehydration therapy, and effective antibiotic availability.

Where marks are lost

Losing drawing marks in Paper 34 due to discontinuous (feathery) lines, overlapping line joins, or unnecessary pencil shading.
Incomplete evaluation answers in Paper 24 that fail to provide paired agree/disagree evidence using extracted numerical values from provided graphs.
Giving generic answers to practical error improvements (e.g. 'do it carefully') rather than naming specific apparatus like a 'colorimeter' or 'thermostatically-controlled water-bath'.

Estimated grade boundary

Updated: 23 Sept 2026

Source: Cambridge International grade thresholds (official)

Grade	Mark	Percentage
A	91/130	70%
B	78/130	60%
C	67/130	52%
D	56/130	43%
E	46/130	35%

The source quotes these grade boundaries out of 130 marks, while this page uses the paper total of 140. Compare the percentages, not the raw marks.

Official grade boundaries published by Cambridge International grade thresholds (official).

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