Graphing : If asked to plot a graph, the independent variable (e.g., temperature or time) belongs on the x-axis, while the dependent variable (e.g., rate of reaction or color intensity) belongs on the y-axis. Experiment C: Plant Tissue Anatomy and Biological Drawing
The Cambridge 2020 practical exams centered on and enzyme-driven color changes in plants. Experiment 1: Beetroot Pigment Release (5090/31) Topic: Osmosis and cell membrane integrity.
While the actual observations may vary slightly depending on the banana sample and conditions, the expected pattern is:
In this core plant physiology experiment, students investigated how temperature affects the release of red pigment from beetroot tissue. o level biology practical 2020 answers
Gas escaped from the rubber bung or delivery tube before it could be measured in the syringe/measuring cylinder.
Utilizing a thermostatically controlled water bath to maintain a constant temperature.
2020 Key Answer Point : If the solution remained blue, reducing sugars were absent. Ensure you always specify the initial and final colors, and explicitly use the word "precipitate" for positive results. : Graphing : If asked to plot a graph,
A recurring question type in O-Level Biology Practicals asks students to identify flaws in the methodology and propose realistic modifications. 1. Temperature Fluctuations
Students were presented with a biological specimen (such as a sliced fruit or leaf cross-section) and instructed to draw a clear diagram. Rules for High-Scoring Biological Drawings:
The factor you measure (e.g., the time taken for the iodine solution to stop turning blue-black). While the actual observations may vary slightly depending
Documenting anatomical specimens with high accuracy.
Acceptable answers include:
The GCE O-Level Biology Practical Examination (Syllabus 6093) assesses not just your theoretical knowledge, but your hands-on laboratory proficiency, observational skills, and data analysis capabilities. The 2020 practical exam stood out for its rigorous focus on enzyme kinetics, physiological responses in plant tissues, and precise biological drawings.
Expected Observations : A color change from yellowish-brown to blue-black indicates the presence of starch. Experiment B: Enzyme Catalysis (Amylase or Catalase)
A significant portion of the marks depended on a freehand drawing of a provided biological specimen or photomicrograph. Cambridge examiners look for strict adherence to standard biological drawing conventions:
