O Level Biology Practical 2020 Answers Repack

Use separate syringes for each sample or rinse thoroughly with distilled water. Key Skills Checklist

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

: Volume of water, surface area/length of beetroot cylinders (e.g., 30 mm), and time of immersion. PastPapers.Co 2. Seedling Growth in Light vs. Dark o level biology practical 2020 answers

Effervescence (bubbling) occurs as oxygen is released. Why catalase only breaks down

Use a gas syringe to measure the exact volume of gas evolved instead of counting bubbles. Use a thermostatically controlled water bath to maintain a constant temperature. Question 2: Food Tests and Biological Drawings Use separate syringes for each sample or rinse

Do not spend too much time trying to get "perfect" data. If an experiment goes slightly wrong, record your actual observations honestly and explain the anomaly logically in the evaluation section. Cambridge rewards experimental honesty paired with strong analytical reasoning.

Measure the rate of reaction by observing the volume of oxygen produced by catalase or the time taken for starch to disappear using amylase. Expected Answers/Methodology: : Volume of water, surface area/length of beetroot

2H2O2Catalase2H2O+O2 (g)2H sub 2 O sub 2 2H sub 2 O plus O sub 2 (g) Experimental Setup and Methodology