O Level Biology Practical 2020 Answers (VERIFIED — PICK)

In the 2020 series, many students received a set of unknown solutions (A, B, C, D) and had to identify reducing sugars, starch, protein, and fat.

Express the final answer clearly with a multiplication sign (e.g., ×15cross 15 ×4.5cross 4.5 ). Round to one decimal place if necessary. ⚠️ Critical Sources of Error and Practical Improvements

It explains why students lost marks. For example, it might say, "Many candidates failed to mention that the Benedict's solution needed to be heated." This provides insight that a simple "Answer: Glucose" list cannot.

If your drawing measures 30 mm and the actual specimen is 10 mm, the magnification is ×3cross 3 4. Sources of Error and Improvements o level biology practical 2020 answers

(Note: This analysis focuses on the widely sat format. If you are sitting a different exam board, the concepts regarding planning and data analysis will still apply.)

Gas escaped from the rubber bung or delivery tube before it could be measured in the syringe/measuring cylinder.

[O Level] 6093/03 Pure Biology Practical Megathread : r/SGExams In the 2020 series, many students received a

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.

Use at least 50% of the grid, label axes with units, and mark points with a neat '

How does sucrose concentration affect change in mass? ⚠️ Critical Sources of Error and Practical Improvements

List the apparatus and materials needed for the experiment:

Apply petroleum jelly (Vaseline) around the joints of the apparatus to ensure an airtight seal. 🎯 Key Takeaways for Future Biology Practicals

HCl inhibited the browning enzyme, while cutting increased the surface area for oxidation. 💡 Practical Success Tips

flowers often have large petals as landing sites for insects and non-pendulous stamens.

Cambridge International published the mark scheme for the 2020 series despite students not sitting the exams. The official document provides invaluable guidance on how marks are allocated.