Level Biology Practical 2020 Answers //top\\ - O

The October/November 2020 Paper 3 (Practical Test), code , centred on an investigation into the factors affecting the rate at which bananas turn brown. This is a classic experiment exploring enzymatic browning (catalysed by polyphenol oxidase, PPO), which links directly to your syllabus topics on enzymes and their factors.

A recurring question type in O-Level Biology Practicals asks students to identify flaws in the methodology and propose realistic modifications. 1. Temperature Fluctuations

Use boiled potato extract (or water instead of potato). No bubbles → confirms enzyme was denatured.

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Explain the behind non-reducing sugar tests or serial dilutions.

Create a checklist of practical skills you need to improve:

: A common requirement was to calculate the actual size of a specimen (e.g., a testis tubule or leaf) using the formula: Summary of Results for Singapore SEAB 6093/03 The October/November 2020 Paper 3 (Practical Test), code

The 2020 paper focused heavily on physiology, enzyme activity, and food tests. Candidates were assessed on their ability to follow complex technical instructions, record accurate qualitative observations, plot precise graphs, and link experimental results to underlying biological theories. Key Skills Tested

Your recorded pH values must be consistent with the treatments. Slice A was dipped in HCl, so a low pH (acidic) is expected. Slice C is an untreated banana, which has a neutral pH. Inconsistent readings would indicate a procedural error and cost you marks.

Based on examiner reports from similar practical assessments, here are frequent errors that cost candidates marks: This public link is valid for 7 days

Here are answers to some common questions about the practical paper:

Most O Level Biology practical exams in 2020 tested these three core areas:

Expected Observations : A color change from yellowish-brown to blue-black indicates the presence of starch. Experiment B: Enzyme Catalysis (Amylase or Catalase)

It improves the of the results by minimizing the effect of anomalies or outliers.