O Level Biology Practical 2020 Answers ⚡ Plus

This was the most common 2020 practical. You were given a table of potato strip lengths in different sucrose concentrations (0.0M, 0.2M, 0.4M, 0.6M, 0.8M).

The O Level Biology Practical 2020 answers reveal a clear pattern: examiners reward precision in method (step-by-step), accurate scientific vocabulary (plasmolysis, not "shrunk"), and well-annotated drawings.

Final actionable advice:

Good luck with your O Level Biology revision. Master the 2020 practical answers, and you will be ready for any food test, osmosis, or enzyme question that comes your way. o level biology practical 2020 answers

Need more help? Leave a comment below with the specific variant (e.g., 5090/33/O/N/20) and question number, and we will provide the exact mark scheme answer.

O Level Biology Practical 2020: Experiment 3 - Investigating Photosynthesis

Answer: Water moved into potato cells by osmosis down a water potential gradient, making cells turgid (increase in length/mass). This was the most common 2020 practical

Answer: 0.4 M sucrose (isotonic point – water potential equal inside and outside cells).

This is often the most distinguishing section of the paper.

A classic planning question appeared: "Plan an experiment to investigate the effect of light intensity on the rate of photosynthesis of Canadian pondweed (Elodea)." Good luck with your O Level Biology revision

Question: Why is the shoot cut underwater before assembly?

Answer: To prevent air bubbles from entering the xylem vessels, which would block water movement.

Typical result: Rate of transpiration increases with temperature, air movement, and light intensity; decreases in high humidity.