O Level Biology Practical 2020 Answers Jun 2026

Use a thermostatically controlled water bath to maintain a constant temperature throughout the investigation. 2. Subjective Color Determination

The Cambridge 2020 practical exams centered on and enzyme-driven color changes in plants. Experiment 1: Beetroot Pigment Release (5090/31) Topic: Osmosis and cell membrane integrity.

In this article, we will recreate the definitive "answer key" for these unique papers. We'll analyze the real questions, break down the official mark schemes, and show you exactly what the examiners were looking for to help you prepare for your exams.

The exact questions vary by regional variant. This article provides the accepted answers for the most common 2020 practical scenarios. o level biology practical 2020 answers

Identifying controlled variables, sources of error, and suggesting robust improvements. 🔬 Question 1: Enzyme Activity & Food Tests

To ensure maximum marks in future practical examinations, keep these fundamental tips in mind:

Dissolve sample in ethanol, shake vigorously, then pour the liquid into a test tube containing cold water. A clear solution turns into a . ✏️ Question 2: Biological Drawings & Microscopy Use a thermostatically controlled water bath to maintain

Magnification=Size of Image (your drawing)Size of Actual SpecimenMagnification equals the fraction with numerator Size of Image (your drawing) and denominator Size of Actual Specimen end-fraction

When assessing a chosen variable, verify that all other confounding variables (e.g., volume, pH, concentration) remain perfectly fixed.

Using the same syringe or dropper for both starch and amylase without washing, causing the reaction to start prematurely. Question 2: Biological Drawing and Magnification The exact questions vary by regional variant

" sign in front of it, rounded to one decimal place or a whole number (e.g., ×2.5cross 2.5 ×3cross 3

To secure full marks for data presentation, tables must feature clear column headers with slash-separated units. Temperature ( ∘Craised to the composed with power C Time Taken for Iodine to Remain Yellowish-Brown ( Rate of Starch Hydrolysis ( s-1s to the negative 1 power Graph Plotting Checklist

Must include both the variable name and metric units. Scale: Must occupy more than half of the grid provided.

Paper 6 (Alternative to Practical), code , is equally revealing. This paper assessed your theoretical knowledge of practical work through a written paper.

The 2020 O Level Biology Practical examination tested candidates on four core skills: , (2) Observation & drawing , (3) Interpretation & analysis , and (4) Planning & evaluation . While specific answer sheets are confidential, the expected answers followed recurring themes: food tests, enzyme activity, osmosis, transpiration, and microscopy.