Mastering OCR AS Level Biology A requires absolute precision in scientific vocabulary, a flawless protocol for biological drawings, and strong mathematical competence to tackle the 10% quantitative component. This guide details key examiner insights, paper structures, and actionable strategies to maximize your marks on both the Breadth and Depth papers.
A scientific or graphical calculator that meets JCQ regulations may be used (some GCSE Mathematics and Science papers are non-calculator). Graphical calculators must be set to exam mode; you must clear any stored programs, notes or data before the exam, and the calculator must not be able to retrieve stored text or formulae.
AO1: Demonstrate knowledge and understanding of scientific ideas, processes, techniques and procedures (38%)
AO2: Apply knowledge and understanding of scientific ideas, processes, techniques and procedures (42%)
AO3: Analyse, interpret and evaluate scientific information, ideas and evidence (20%)
過去問と採点基準にもとづいて作成（2022–2024）。
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 under JCQ rules, but you must still show your method — an unsupported calculator answer earns no method marks. Clear all stored programs, notes and data (graphical calculators in exam mode) before the exam.
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 under JCQ rules, but you must still show your method — an unsupported calculator answer earns no method marks. Clear all stored programs, notes and data (graphical calculators in exam mode) before the exam.
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 under JCQ rules, but you must still show your method — an unsupported calculator answer earns no method marks. Clear all stored programs, notes and data (graphical calculators in exam mode) before the exam.
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 under JCQ rules, but you must still show your method — an unsupported calculator answer earns no method marks. Clear all stored programs, notes and data (graphical calculators in exam mode) before the exam.
よくあるミス
1high影響する配点: 2Biological membranes
Confusing 'sucrose solution' with 'sucrose' when explaining osmosis and concentration gradients, stating that the 'sucrose solution diffuses'.
回避方法: Always state that water molecules move via osmosis down a water potential gradient, or that sucrose solutes diffuse down a concentration gradient. Never say the 'solution' diffuses.
2medium影響する配点: 1Communicable diseases, disease prevention and the immune system
Confusing the organelle 'lysosome' with the hydrolytic digestive enzyme 'lysozyme' during phagocytosis or cell structure explanations.
回避方法: Identify the lysosome as the membrane-bound vesicle/organelle, and the lysozyme as the chemical enzyme contained within it that hydrolyzes the pathogen.
3high影響する配点: 1Exchange surfaces
Describing the alveoli adaptation as having 'thin cell walls' or 'thin membranes'.
回避方法: Explicitly state that the alveoli consist of a 'thin layer of squamous epithelium' that is one cell thick to ensure a short diffusion distance.
4medium影響する配点: 1Transport in animals
Drawing biological label lines without a ruler, allowing them to cross, or adding arrowheads.
回避方法: Use a sharp pencil and a ruler to draw straight, non-overlapping lines that touch the target structure precisely. Never include arrowheads.
5medium影響する配点: 1Enzymes
Drawing ruled, straight point-to-point lines on enzyme/transpiration rate graphs instead of a smooth, continuous line of best fit.
回避方法: Draw a smooth, single, continuous curved line of best fit through the plotted points unless explicitly instructed to connect points with straight lines.
6high影響する配点: 1Biodiversity
Failing to round final calculated values (such as Simpson's Index or percentage change) to the requested number of significant figures.
回避方法: Read the rounding instructions at the end of the calculation question carefully (e.g., 'Give your answer to 2 significant figures') and round appropriately.
7medium影響する配点: 1Transport in plants
Assuming that the Casparian strip blocks the symplast pathway in plant roots.
回避方法: Remember that the Casparian strip (made of suberin) is impermeable and blocks the apoplast pathway (cell walls), forcing water into the symplast pathway (cytoplasm).