Level Biology Practical 2020 Answers | O
0.4 M sucrose (isotonic point – water potential equal inside and outside cells).
Q3. Suggest two improvements to the procedure.
A major portion of the 2020 paper centered around an investigation involving cellular enzymes (often catalase or amylase) or a series of unknown solution tests. Part A: Investigating Enzyme Reaction Rates o level biology practical 2020 answers
The second half of the 2020 paper prioritized observation skills, requiring an accurate biological drawing of a plant specimen (such as a transverse section of a stem, root, or leaf) or an insect structure. Guidelines for a Perfect Biological Drawing
: Candidates were asked to provide a line drawing of 5 tubules of a testes and calculate actual diameter using magnification. 2020 Cambridge O Level (5090/31) Practical Key Topics A major portion of the 2020 paper centered
This is the hands-on version of the same banana browning experiment described above. However, in the practical test, candidates perform the experiment themselves and record their own observations.
Volume of gas produced in a set timeframe, or the time taken for a color change to occur. Model Answers and Observations 2020 Cambridge O Level (5090/31) Practical Key Topics
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In 2020, students were instructed to observe a specimen, cut a cross-section, and produce a detailed biological drawing. Rules for an O-Level Biological Drawing
Label lines must be straight, drawn with a ruler, and must never cross each other . The pointer line must touch the exact structure being named. Calculating Magnification
A major component of the 2020 exam involved investigating the effect of a specific variable (such as temperature, pH, or substrate concentration) on enzyme activity. A common variant of this paper used (from potato or liver discs) reacting with hydrogen peroxide, or amylase reacting with starch. Sample Experimental Setup