: Common improvements include using a thermostatically controlled water bath for better temperature control.
Identifying tissues, calculating magnifications, and drawing specimens.
Q: Calculate percentage change for sample: initial 2.50 g → final 2.15 g.
Difficulty in counting rapidly rising bubbles accurately, or a drop in water bath temperature during the experiment. o level biology practical 2020 answers
Students were required to analyze an unknown solution (often labeled Solution X) to determine its nutrient composition. :
A staple of the O Level Practical is the low-power or high-power plan drawing of a biological specimen, such as a cross-section of a stem or leaf. :
: This task required candidates to determine the concentration of glucose in simulated "urine" samples. Difficulty in counting rapidly rising bubbles accurately, or
This is often the most distinguishing section of the paper.
Ultimate Guide to the 2020 O-Level Biology Practical (5090/03)
Assign the independent variable to the x-axis and the dependent variable to the y-axis. Use at least half of the grid space provided. : : This task required candidates to determine
Sample B usually showed the fastest change (shortest time), indicating the highest glucose concentration. 2. Plant Biology: Beetroot Pigment and Photosynthesis
Comparing the amount of catalase enzyme in different fruits (e.g., banana vs. pineapple) by measuring the rate of oxygen bubble production.
Mastering the GCE O-Level Biology Practical (2020): Insights and Answer Guide
The 2020 practical exam focused heavily on core syllabus themes, testing students' abilities to execute protocols precisely and draw accurate conclusions from raw observations. The paper primarily assessed:
Procedure : Add equal volumes of Benedict's solution and the sample into a test tube. Heat in a boiling water bath for 3–5 minutes.
