O Level Biology Practical 2020 Answers Jun 2026

To help you prepare effectively for similar practical exams, let me know:

Describe the procedure for the experiment:

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

Use a to measure exact volumes (e.g., 4. Pro-Tips for Acing Your Biology Practical Exam

Gas loss from the delivery tube before the rubber bung could be fully sealed. o level biology practical 2020 answers

Disclaimer: The answers provided here are based on general pedagogical reviews of the 2020 Cambridge O Level Biology practical papers and should be used as a study guide.

Explanation : High temperatures denature the proteins embedded in the cell membrane and disrupt the phospholipid bilayer. This makes the cell membrane fully permeable, allowing the vacuolar red pigment (betalain) to leak out rapidly via diffusion.

Qualitative testing for glucose, starch, and proteins.

If you are currently preparing for upcoming practical exams, practicing past papers under strict time constraints is the most effective way to build laboratory confidence and master exam techniques. To help you prepare effectively for similar practical

Students were typically provided with a substrate (e.g., hydrogen peroxide or starch solution) and an enzyme source (e.g., yeast suspension or plant extract). Typical Experimental Setup

Candidates placed uniform strips of plant tissue (such as potato tubers or onion epidermis) into varied concentrations of sucrose or sodium chloride solutions.

Measure the same length on the actual specimen or reference photograph.

To refine your study, you can download official mark schemes and examiner reports from platforms like PapaCambridge or Save My Exams . Disclaimer: The answers provided here are based on

, which affected their ability to correctly annotate features like the stigma or petals. 3. Key Concepts to Remember To "ace" similar practicals, examiners look for: Data Recording:

If the experiment required calculating the rate of reaction, the formula used was:

To observe mitosis in root tips.

If you need help with or magnification formulas

Question 2: Biological Drawings, Calculations, and Food Tests

Suggesting improvements to experiments, such as using a buffer solution to control pH. Final Thoughts for 2026 Candidates