An expert examiner-backed guide for Pearson Edexcel International AS Level Biology (WBI11/WBI12/WBI13), combining past paper evidence, practical skill rubrics, and high-yield study strategies.
読了時間 5 分更新日: 2026年6月21日
試験の概要
試験数
3
満点
210
制限時間
4時間 20分
出題形式
4
試験
時間
配点
問題数
配点比率
出題形式
WBI11/01
1時間 30分
80
9
40%
Multiple Choice, Short Answer, Calculations & Math, Extended Open Response (including LOR)
WBI12/01
1時間 30分
80
8
40%
Multiple Choice, Short Answer, Calculations & Math, Extended Open Response (including LOR)
WBI13/01
1時間 20分
50
3
20%
Multiple Choice, Short Answer, Calculations & Math, Extended Open Response (including LOR)
評価段階
ABCDEU
電卓の規定
A scientific or graphical calculator is permitted. Graphical calculators must be in exam mode with all stored programs and data cleared before the exam; the calculator must not be able to retrieve stored text or formulae.
AO1: Knowledge and Understanding of Biology (35%)
AO2: Application of Knowledge and Understanding (45%)
AO3: Experimental and Practical Skills (20%)
過去問と採点基準にもとづいて作成（2023–2026）。
電卓プログラム
Graph: zeros, intersections & turning points
Graphical calculator / GDC (exam mode)
目的: Plot a function to read its roots (zeros), points of intersection, and maxima/minima.
使う場面: Checking solutions, sketching, or solving where an analytic method is hard.
手順
Graph the function(s) and use the built-in zero, intersect and maximum/minimum tools.
試験での注意: Allowed, but clear stored programs/data (graphical calculators in exam mode) and show the required working — unsupported calculator answers score no method marks.
Numerical equation solver
Graphical calculator / GDC (exam mode)
目的: Solve an equation or find a variable numerically when an algebraic route is long or implicit.
使う場面: Iterative or implicit equations, or to confirm an algebraic solution.
手順
Use the equation/zero solver, entering the equation and a sensible starting estimate.
試験での注意: Allowed, but clear stored programs/data (graphical calculators in exam mode) and show the required working — unsupported calculator answers score no method marks.
Numerical integration & differentiation
Graphical calculator / GDC (exam mode)
目的: Evaluate a definite integral \(\int_a^b f(x)\,dx\) or a gradient \(f'(x)\) at a point.
使う場面: Checking calculus answers, or where only a numerical value is needed.
手順
Use the GDC's numeric integral / derivative function with the limits or the point.
試験での注意: Allowed, but clear stored programs/data (graphical calculators in exam mode) and show the required working — unsupported calculator answers score no method marks.
Statistics & probability distributions
Graphical calculator / GDC (exam mode)
目的: 1-var/2-var statistics, linear regression, and cumulative binomial / normal / Poisson probabilities without tables.
使う場面: Statistics questions and hypothesis tests.
手順
Enter data in the statistics editor, or use the distribution menu (binomial cdf, normal cdf, …).
試験での注意: Allowed, but clear stored programs/data (graphical calculators in exam mode) and show the required working — unsupported calculator answers score no method marks.
よくあるミス
1high影響する配点: 3Molecules, Transport and Health
Failing to draw a precise tangent line at the exact time coordinate requested on curved rate graphs.
回避方法: Align your ruler flat to the outer edge of the curve at exactly the requested point (e.g. 30 minutes) to ensure the tangent line has the correct, balanced slope before calculating dy/dx.
2medium影響する配点: 4Membranes, Proteins, DNA and Gene Expression
Omitting parent genotypes, gamete circles, or clear offspring phenotype links in genetic diagrams.
回避方法: Explicitly write out and label: 1. Parent Phenotypes, 2. Parent Genotypes, 3. Gametes (circled), 4. Offspring Genotypes, and 5. Offspring Phenotypes matched directly to their genotypes.
3high影響する配点: 2Practical Skills in Biology I
Omitting the thorough washing of beetroot discs in pigment/membrane leakage practical designs.
回避方法: Always state that beetroot discs must be washed in distilled water until no more pigment leaks out before exposing them to the experimental temperatures/solvents.
4high影響する配点: 2Cell Structure, Reproduction and Development
Losing marks on magnification calculations by dividing millimeters directly by micrometers without converting.
回避方法: Multiply your millimeter measurement by 1000 to convert to micrometers before dividing by the actual size (A = I / M).
5high影響する配点: 2Practical Skills in Biology I
Concluding a significant difference exists when standard deviation error bars overlap on a graph.
回避方法: If standard deviation error bars overlap, always state that the difference between the means is not statistically significant.
6medium影響する配点: 3Coordination, Response and Gene Technology
Confusing DNA methylation (adding a methyl group to cytosine bases in DNA) with histone modification (acetyl/methyl groups on histone proteins).
回避方法: Specify that DNA methylation involves adding a methyl group directly to a cytosine base (CpG island) in the DNA template to block RNA polymerase binding.
7medium影響する配点: 3Molecules, Transport and Health
Omitting named heart chambers or valves when tracing the pathway of a broken-off blood clot causing a pulmonary embolism.
回避方法: Trace the blood clot's precise path: deep leg vein → vena cava → right atrium → tricuspid (atrioventricular) valve → right ventricle → pulmonary artery → lungs.
8high影響する配点: 1Common Units and Calculations
Using the wrong denominator in percentage change calculations (dividing by the final value instead of the initial value).
回避方法: Always calculate: ((Final - Initial) / Initial) * 100. Double check that the denominator is your starting/initial baseline value.