: In biological explanations, avoid vague terms like "help" or "facilitate". Instead, be precise about the impact of a variable (e.g., "increases the rate of reaction").
For students preparing for the O Level Biology examination, the practical component—whether the hands-on Practical Test (Paper 3) or the Alternative to Practical paper (Paper 4/6)—is a crucial part of the assessment. The 2020 series, though disrupted by the COVID-19 pandemic, still provides valuable question papers and official mark schemes that are essential for revision. This article serves as a comprehensive breakdown of the 2020 practical papers, including answer keys, marking guidelines, examiner expectations, and preparation strategies. o level biology practical 2020 answers
Data: 0.0 M: mass change +12%; 0.2 M: +5%; 0.4 M: 0%; 0.6 M: −6%; 0.8 M: −12%. : In biological explanations, avoid vague terms like
Example: "Explain why the slice cut into small pieces turned brown faster than the untreated slice." The 2020 series, though disrupted by the COVID-19
Add Biuret solution (or sodium hydroxide followed by copper sulfate) to the mixture.