O Level Biology Practical 2020 Answers 2021 Direct

All raw measurements must be recorded to the same degree of precision (e.g., if using a standard stopwatch, record times to the nearest whole second or 0.5 seconds consistently). 2. Plotting the Graph

The 2020 papers are a goldmine for revision. Here is your actionable checklist:

The independent variable (e.g., Temperature) belongs on the x-axis. The dependent variable (e.g., Rate of reaction) belongs on the y-axis. Both must be labeled clearly with units. o level biology practical 2020 answers

High temperature breaks hydrogen bonds in the enzyme’s tertiary structure, altering the active site so substrate cannot bind (denaturation).

A mandatory component of the practical paper involves critiquing an existing experiment or designing a new one from scratch. Identifying Sources of Error All raw measurements must be recorded to the

What you measure (e.g., volume of gas, time for reaction).

: Compare catalase enzyme activity in different fruits (e.g., banana, pineapple) and perform biological drawings. Here is your actionable checklist: The independent variable

Always construct tables with neat, ruled lines. Headings must clearly state the quantity and its unit separated by a slash (e.g., Time / minutes , Temperature / °C ). Never write units inside the data cells. Graph Plotting:

Use a sharp pencil to draw small, precise 'x' marks for data points. Connect the points with a smooth, best-fit curve or straight lines from point to point, depending on the explicit instruction. Do not extrapolate the line beyond the collected data points unless instructed. 3. Explaining Biological Trends