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Sample B usually showed the fastest change (shortest time), indicating the highest glucose concentration. 2. Plant Biology: Beetroot Pigment and Photosynthesis
This was the most common 2020 practical. You were given a table of potato strip lengths in different sucrose concentrations (0.0M, 0.2M, 0.4M, 0.6M, 0.8M).
| Test | Reagent | Positive Observation (Expected Answer) | |------|---------|----------------------------------------| | Reducing sugar | Benedict’s solution | Blue → Brick-red/orange precipitate upon heating | | Starch | Iodine solution | Brown/yellow → Blue-black | | Protein (biuret) | Biuret test (NaOH + CuSO₄) | Blue → Lilac/violet | | Fat (lipid) | Ethanol emulsion | Clear → Milky white emulsion |
), while a sample that remained blue after two minutes indicated o level biology practical 2020 answers
Any valid factor that could affect growth, other than light, is acceptable. This tests your understanding of a fair test.
Students were tasked with measuring the rate of reaction of an enzyme (e.g., amylase breaking down starch, or catalase breaking down hydrogen peroxide). Sample Table Construction
A: Yes, you can be. If the spelling mistake changes the meaning of the word or prevents the examiner from recognizing the term, you will not receive the mark. For example, spelling "nucleus" as "nuculus" would likely be accepted, but spelling it as "new clear" would not. Sample B usually showed the fastest change (shortest
Use a colorimeter for more objective measurement.
By focusing on skill development and strategic practice with official resources, you can approach your O Level Biology practical exam with confidence. Good luck with your studies!
Students often face challenges in the O Level Biology Practical examination, including: You were given a table of potato strip
In some versions of the 2020 paper, students tested "urine" samples for glucose concentration using the . Time to color change (s) Final Color Estimated Glucose Concentration A Red precipitate High (e.g., 0.62 B Red precipitate Highest (e.g., 0.95 D
October/November 2020 (Paper 5090/6 or Equivalent variants) Difficulty Rating: Moderate to Challenging
Osmosis/diffusion experiments (e.g., potato/tissue mass changes)
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