Use a to maintain a constant temperature. Inconsistent shaking/mixing of reagents Leads to uneven reaction rates in the test tube.
Based on the 2020 examination trends, the practical papers focused heavily on:
Answer without "cm³/s" = zero marks.
You can find full PDF question papers and official marking schemes on educational sites like Save My Exams PapaCambridge , which host the 5090 syllabus materials. step-by-step walkthrough of the magnification calculation or a specific nutrient test protocol 2020 O' Levels 6093/3 - Recommended Answers | PDF - Scribd
Use a or implement a standardized shaking protocol (e.g., shake for 5 seconds after adding reagent). Splitting volumes using standard droppers Drop sizes vary, causing inaccurate reagent volumes. o level biology practical 2020 answers
The solution turns purple or violet. This confirms the presence of protein, as the amylase enzyme itself is a protein. Common Mistakes to Avoid
HCl inhibited the browning enzyme, while cutting increased the surface area for oxidation. 💡 Practical Success Tips Use a to maintain a constant temperature
Qualitative testing for glucose, starch, and proteins.
Difficulty in counting rapidly rising bubbles accurately, or a drop in water bath temperature during the experiment. You can find full PDF question papers and
Distinguish between human errors and systematic experimental limitations.
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