Identifying distinct color changes in biochemical tests.
Many papers asked to plot percentage change in mass (Y-axis) against concentration (X-axis).
Use a sharp HB pencil. Do not shade, sketch, or leave broken gaps in lines. o level biology practical 2020 answers
The core goal of the practical paper is to test your skills in a hands-on environment. The syllabus outlines three key skill areas you need to master:
Sample B usually showed the shortest time (highest concentration). Sample D remained blue, indicating of glucose. Positive results were indicated by a . Enzyme Activity (Catalase): Identifying distinct color changes in biochemical tests
The Cambridge O Level Biology (5090) practical paper is a critical component that tests a student's hands-on skills, observational abilities, and understanding of experimental design. The —including the May/June series—was unique, often challenging students to adapt their knowledge to specific, often unconventional, laboratory scenarios.
: Candidates were required to draw a table with clear headings (e.g., Urine sample , Time taken for colour change / s , Final colour ) and plot a bar graph of concentration against sample. Do not shade, sketch, or leave broken gaps in lines
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Potato strips in high sugar concentration become flaccid (soft) and decrease in length/mass.
