Practical skills - Use and application of scientific methods and practices — OCR A-Level Biology

This practical-skills statement asks you to handle laboratory equipment and materials both safely and correctly, and to do so across a range of items rather than one familiar tool. 'Safely' means controlling hazards: carrying glassware properly, clamping apparatus so it cannot topple, pointing a heated test tube away from people, using goggles and clearing spills. 'Correctly' means using each item for its intended purpose and technique: reading a measuring cylinder at eye level from the bottom of the meniscus, zeroing a balance before weighing, selecting a suitable pipette or burette for the volume needed, focusing a microscope on low power first, and handling reagents without contaminating stock bottles. 'A range' means you should be able to transfer these habits to unfamiliar equipment by reading its instructions and risk information.

This statement asks you to carry out practical work by accurately following written instructions, such as a method sheet or protocol. Following instructions means reading the whole procedure before starting, identifying the sequence of steps, the quantities, concentrations, timings and temperatures specified, and then performing each step in the stated order. It also means recognising when a step is ambiguous or when something has gone wrong, and seeking clarification rather than improvising silently. For example, if a method says to add a reagent dropwise while swirling and to stop at a colour change, you should do exactly that rather than pouring it in at once. Accurate following improves reliability and allows results to be compared with others. In your practical work, annotate the method, tick off steps as you complete them, and note any deviation and its reason.

This skill is about producing reliable primary data, not just looking at a specimen. Making an observation means using an instrument or your senses in a controlled, repeatable way: for example, reading a colorimeter absorbance, timing a reaction with a stopwatch, or counting stomata in a field of view. Recording means writing each value immediately, with its unit, into a pre-prepared table whose headings state the quantity and unit, so raw data are never lost or reconstructed from memory. You must choose an appropriate scale or resolution, take readings at the stated intervals, and note qualitative features such as colour or bubble production where these are the observation. Repeat readings and record them all, including anomalous ones, rather than silently discarding them.

This row is course guidance on how you should keep a practical record, not a separate examinable fact to memorise. Read it as an instruction about your laboratory notebook or practical file. Appropriate records mean a dated, legible account of what you actually did: the aim, the method as carried out (including any changes you made), the apparatus, the raw data in tables with units, and notes on observations and problems. Records should be made as you work, not written up from memory afterwards, and should be clear enough for another student to repeat the activity. You should keep rough readings, calculations and any anomalous results rather than overwriting them. When you read this guidance, check your own notes against these features and correct gaps, such as missing units or undated entries, before submitting practical work.

Presenting information and data scientifically means choosing a format that matches the data and lets a reader extract values quickly and without ambiguity. For continuous variables, such as time against volume of gas evolved, plot a scatter graph with the independent variable on the x-axis, the dependent variable on the y-axis, equal-interval scales, labelled axes with units, and a line or curve of best fit. For discrete categories, use a bar chart with gaps between bars. Record raw readings in a ruled table with a clear heading for each column giving quantity and unit, and keep the same number of decimal places or significant figures as the measuring instrument justifies. Label any diagram, add a title, and state units on every axis. A scientific presentation is judged on clarity, correct units, sensible scale choice and accurate plotting, not decoration.

This practical skill covers three linked activities. First, process data using appropriate software and tools: enter readings into a spreadsheet, use formulae to calculate means, rates or percentage changes, and produce a chart from the processed values. Second, carry out research: locate reliable sources such as textbooks, peer-reviewed articles or reputable scientific websites, record where each fact came from, and judge whether a source is trustworthy. Third, report findings: present the processed data and research clearly, with tables, graphs, citations and a conclusion that the evidence supports. When you read a practical or research task, identify which of these three activities it asks for, then plan the tool, the sources and the reporting format before starting.